Are there any credible conspiracy theories?

Actually there was an insurance case that tried to prove the building was badly constructed (in order to avoid the hefty insurance payout) but an investigation found it wasn't the case.

no conspiracy, unless the israelis are conspiring with themselves. they do have them they just refuse to talk about them.

All-natural collapses it is the descending building that destroys the underneath section.

The engineering issue for building seven, the descending building is not what destroyed the underlying section. It was already cleared away and removed before this descending . . That's impossible, the only known method that can do this is by demolition.

It does take much time and effort to confirm this, you or for others not convinced,

NIST denied freefall when first made statements to the press and waiting media.. Their computer model, the underlaying structure had resistance. NIST models, never changed. It not like the went away and released updates one's based on the new information uncovered. Fact freefall occurred here means external energy was used to clear away the structural columns to allow the top half of the building to fall.

Study NIST's statement with open eyes and you see fires could not have caused the freefall. They denied it anyway. This is not halfway through the study, this was a conference them presenting the draft of the final report - the collapse of building seven ( Six years after it started) after 100s of hours looking at how it may have collapsed.

Statement, this is a denial of freefall.

Breakdown for you.

The analysis is the computer models and studies.

Notice the first line!!

Last line NIST is telling you what their so-called Analysis is showing them!!!

[A] free-fall time would be an object that has no structural components below it.... What the analysis shows...is that same time it took for the structural model to come down...is 5.4 seconds. It’s about 1.5 seconds, or roughly 40 percent, more time for that free fall to happen. And that is not at all unusual because there was structural resistance that was provided in this particular case.”

Hes back to secret Nazis now. For nearly everything.

Whichever parts you find relevant. The opening paragraphs give an overview of the findings.

Nope, they got jumped by truthers who had no interest in the findings, only in discovering something, anything that could be construed as a "mistake".

Here we go again, you are going to take it from the top to rehash every truther talking point to relive the fantasy that a giant plot took place on 9/11 which all the experts, investigators, foreign intelligence agencies, media, everyone missed, except for a bunch of internet people who can't explain what it was nor have an ounce on consensus on it, many of whom (like yourself) coincidentally believe in loads of other conspiracies they can't explain either.

The "smarter" truthers just engage in denial, because anyone, anywhere can pick through the minutiae of any large event or investigation "not getting" certain points, acting incredulous at others, demanding explanations they are never going to accept. I can create an alternative account and do that all day.

It's very simple, if something else happened, explain what it was. Demonstrate it. You should be subjecting it (and other conspiracies) to the same level of scrutiny as you apply to the widely established version of events you are attacking.

You claimed the building fell due to "bad foundations", okay. I've followed this 9/11 stuff I am aware there was a case that covered this, and refuted it, with a thorough study. You asked for the details, I provided it. What is your issue with that?

If there's a study or report or investigation that which determined that cause (or part of the cause) was "bad foundations", fine, feel free to provide it.

Couple of conspiracy theories, scoffed at, at first then proved to be true

THE GREAT LIGHTBULB CONSPIRACY The Phoebus cartel engineered a shorter-lived lightbulb and gave birth to planned obsolescence

The Tuskegee Syphilis experiment, gave rise to a conspiracy theory that the US government was withholding syphilis diagnosis on purpose and then giving placeboes to see what happened!

Turned out to be true and on May 16, 1997, President Bill Clinton formally apologized on behalf of the United States to victims of the study, calling it shameful and racist. "What was done cannot be undone, but we can end the silence," he said. "We can stop turning our heads away. We can look at you in the eye, and finally say, on behalf of the American people, what the United States government did was shameful and I am sorry.

Didn't the CIA infiltrate the Black Panthers in the 60's and drum up extremism?

The whole study concerns why WTC 7 fell and how it wasn't due to design/construction errors, so it's all relevant. To summarise:

Basis of the study:

This report is in rebuttal to the reports [Bailey, 2010], [Nordenson, 2010a], [Nordenson 2010b], [Colaco 2010] and [Torero 2010] offered by plaintiffs’ experts concerning the collapse of 7 World Trade Center (WTC 7) as a result of the terrorist attacks on September 11, 2001. The plaintiffs’ experts’ central hypothesis is that design and construction errors were the proximate cause of the collapse of WTC 7 and that WTC 7 would not have collapsed but for these errors. I, together with a team of colleagues at Weidlinger Associates Inc., have undertaken a careful review of the opinions of plaintiffs’ experts, and especially of the computer analyses and data which are proffered as a basis for those opinions. 

Summary of conclusion:

Based on our analyses and critical review of the analyses, data and engineering judgment of plaintiffs’ experts, we find all of the design errors asserted as a cause of collapse to be either unfounded or based on  erroneous, and even contrived, analyses. Our analyses clearly establish that the attacks of September 11 set-off an unstoppable chain of events, given the circumstances of the day, of such magnitude as to exhaust the capacity of the building structural system over the course of seven hours leading to the ultimate collapse of WTC 7. As discussed herein, the claimed “defects” featured in plaintiffs’ experts’ reports are not defects at all. And none of the changes advocated by plaintiffs’ experts would have prevented the collapse.

The WTC 7 Building Was Appropriately Designed and Consistent with NYC Building Code Our comprehensive review of the structural design of the WTC 7 Building confirmed that the building was appropriately designed for its intended use. The building was also in compliance with the New York City Building Code. Mr. Levy, in his expert report [Levy, 2010], further determines that the design elements in WTC 7 are consistent with many tall office buildings in New York, including those whose design he has overseen. The WTC 7 Building Collapsed as an Inevitable Consequence of the September 11 Terrorist Attacks Turning our attention to the events of September 11, our analysis of the available photographic, videographic and eyewitness accounts reveals that the collapse of WTC 1 showered a massive amount of hot debris unto WTC 7, severing and destroying substantial portions of the south-facing structural system. As documented in Dr. Beyler’s report [Beyler, 2010], the debris ignited multiple fires on multiple floors of WTC 7. The debris destroyed many of the barriers designed to prevent the spread of fire, and destroyed the sprinkler system designed to retard fire, with the consequence that the fires circulated freely around the building over the course of the day. The NYC Fire Department, having suffered an unprecedented loss of firefighters, lacking water to fight the fires, and concerned about visible structural damage to the building, made the wise decision not to fight the fire once the building occupants had been fully evacuated. The fires were therefore allowed to burn unfought and uncontrolled. In testament to its resilience, WTC 7 withstood massive damage, including the loss and impairment of over a third of its south perimeter column lines, until late in the day on September 11. But multiple unchecked traveling fires, burning simultaneously on consecutive floors, continued their attack on the building. Dr. Beyler [Beyler, 2010] highlights the unusual aspects of such a fire environment, which would not be expected outside of the extraordinary circumstances of September 11. Observations on the day suggest that an unique fire environment was present on the 8th and 9th floors of the building. This imposed high temperatures onto the 9th and 10th floors structures. We undertook a series of high-fidelity nonlinear thermo-mechanical computational analyses to track the highly complex evolution of the structural system response over time under the steel temperatures that Dr. Beyler [Beyler, 2010] derived. We did so by using Weidlinger–developed commercial software, which has been extensively validated for the regime of physics associated with the collapse and destruction of structures, called FLEX. Our analyses include detailed modeling of the entire floor plate east of column line 76-77-78, where the level of resolution includes explicit representation of every element – to the level of every bolt, connection plate and shear stud – that was used in the construction of WTC7. Our analyses show that the initiation of structural failure occurred as a result of high steel temperatures, which degraded the strength and stiffness of the framing and connections, and resulted in very large movements of the floor. These high temperatures occur, not as a result of some defect in the thermal insulation provided by the fire protective material on the steel, but rather by virtue of the long duration of the fires, their extent and locations, and the absence of any fire suppression. When failure does initiate on the east of the 10th floor, as a result of fires on the 9th floor, it occurs in the connections between the beams, and girders. An unzipping of the finplate connections, which connect the floor beams to the girder spanning the east side of the core, occurs and propagates to wider areas of the floor until the entire eastern section of the floor and adjoining bays collapse unto the 9th floor. A key conclusion from this early stage of the collapse sequence is that the particular type of connection is irrelevant to the collapse. Several different types of connections were used on the WTC 7 floors (typically seated, header, fin plate, knife and seated web clip connections), each of which would have been severely challenged by the fire environment on September 11. Our studies indicate that if a particular connection was hypothetically prevented from failing, another one in the vicinity, possibly of a different type, would have failed anyway within minutes, resulting in the same outcome, namely a widespread collapse of the floor system. Accordingly, this is not an instance of a poorly-chosen design detail leading to a collapse, as one of plaintiffs’ experts suggests; rather the floor collapse is a function of the unique and extreme fire environment which had the capacity to overwhelm each type of connection. (continued)

All there in the first few pages. TLDR: the building fell due to fire, not shoddy construction/design.

No study or investigation discovered any "inside job". Still waiting for your conspiracy.