Where are cops trained to do this?

Cops at University of Alabama respond to noise complaint. A simple civil upset that many people on this forum would be familiar with (often begrudging the fact that Gardai can't/won't do much).

So obviously, this being the USA in 2015, coming over to ask a bunch of college students to turn down the noise, progressed into staged assault, forced entry, tazing, and baton-beating. Three officers are now on administrative leave.

When the first phone starts recording, the cop has already entered through the threshold of this apartment, the occupants are protesting the right of the officer to enter (who cannot, afaik, enter without permission for a simple noise complaint) who is holding someone's arm.

This goes on for the next 2 minutes. Basically, this cop knows he is in the wrong. If he was validated and justified, he would wait outside for backup who would re-start the interaction from there and cooler heads prevail. Instead, the cop loses his head and falsely accuses an occupant of grabbing *his* arm, grabs the occupant's shirt, and enters a 'stalemate', even acts the child with the ol' foot in the door gag. What's wrong here too, is that he places the guy under a false arrest for 'touching his arm' which is 1) empirically false and 2) the weakest reason to arrest someone I've ever heard of. Even in a close quarters situation like this: if you brush up against someone, that does not qualify as an assault to commit a battery. Someone please tell me if they can find news reports of someone in jail for "touching a cop on the arm/shoulder etc" (keep it clean AH). You'll more than likely come up with some greater offense. But bottom line, he wants to try and arrest the teen not because he feels threatened.

At 2 minutes into the video, the officer makes eye contact with something (someone, the backup officers) outside. He then immediately gives up the stalemate, and jumps into the house as if he has been dragged in by the occupant. This triggers the raid.

From additional angles provided by other apartments, we can see that some of them have been drug outside, thrown against the wall, tazed, and instead of being handcuffed at any point leading up to THAT, are ****ing beaten in the ribs with a nightstick.

When another woman who is still in the apartment asks why there are so many officers, one cop shouts, "Shut your ****ing mouth." When he walks away, someone in the apartment says, "I'm glad this is all on video." The officer responds, "I don't give a ****." Another officer tells the students still inside the apartment to go upstairs or they will be arrested too.

The first officer, without question, is completely wrong. That's not even the most troubling part - it's the fact that the reaction of the cops who just arrived on the scene is to do the tazing and the beating. These are cops, they are college students. The closest thing they have to a deadly weapon is a beer pong ball. I just can't put myself in the shoes of the 2nd/3rd officer who thought it made any sense to use the nightstick. Is it like a ****ing dog chasing a ****ing squirrel? A pitbull chasing a tennis ball? I don't get it. I just don't.

Apparently the students have decided to give this #FratLivesMatter.. which when you think about it, makes the same point #BlackLivesMatter does, but for college students (and therefore more of "my parents' money" vibe).