If the British state (at the highest level) was involved in the Dublin Monaghan bombings what do you think the reasoning was?
At the time of the bombings, Colin Wallace was a British Intelligence Corps officer at the British Army's Northern Ireland headquarters. Since his resignation in 1975, he has exposed scandals involving the security forces, including state collusion with loyalists. He gave evidence to the Barron Inquiry.
In an August 1975 letter to Tony Stoughton, chief of the British Army Information Service in Northern Ireland, Wallace writes:
There is good evidence the Dublin bombings in May last year were a reprisal for the Irish government's role in bringing about the [power sharing] Executive. According to one of Craig's people [Craig Smellie, the top MI6 officer in Northern Ireland], some of those involved – the Youngs, the Jacksons, Mulholland, Hanna, Kerr and McConnell – were working closely with [Special Branch] and [Military Intelligence] at that time. Craig's people believe the sectarian assassinations were designed to destroy Rees's attempts to negotiate a ceasefire, and the targets were identified for both sides by [Intelligence/Special Branch]. They also believe some very senior RUC officers were involved with this group. In short, it would appear that loyalist paramilitaries and [Intelligence/Special Branch] members have formed some sort of pseudo gangs in an attempt to fight a war of attrition against the PIRA by getting paramilitaries on both sides to kill each other and, at the same time prevent any future political initiative such as Sunningdale.
In a further letter of September 1975, Wallace wrote that MI5 was backing a group of UVF hardliners who opposed the UVF's move toward politics. He added:
I believe much of the violence generated during the latter part of last year was caused by some of the new [Intelligence] people deliberately stirring up the conflict. As you know, we have never been allowed to target the breakaway UVF, nor the UFF, during the past year. Yet they have killed more people than the IRA!
Colin Wallace was extremely high up in British intelligence and his claims are known to be highly credible, most of his claims were not made available until years and years after he made them, feel free to read up about him he also attempted to bring attention to the kincora boys scandal years before the RUC had ever even given it any attention.
This is only one person's word the evidence that the British state were responsible for these bombings would fill a history book.