I was answering a post that said it had nothing to do with her as she wasn't in power. Bloody Sunday became much more than one incident because of the way it was handled by the British State. The army had shot and killed it's own unarmed civillians outside their homes. Imagine it was in Shepards Bush, now you tell me how it could have played out differently? An enquiry maybe? Some respect for the dead? Too much?
I acknowledged there is a deabte to be had about her overall, but in terms of Northern Ireland there really isn't. She bred sympathy in The Republic with her attitude to the Northern situation. So in terms of turning the Bloody Sunday shootings into a massive injustice and a symbol for British disinterest in catholic rights and thus fuelling the violence and ill feeling, yes, she is to blame as much as anyone. If you can argue then fine, but the as I said 'it was like that when I got here' doesn't cut it as the cover up was just as damaging overall.
edit - as for the bolded bit. That's simply not true. There was one immediately, all wrapped up in two months and cleared the military. The one that actually investigated was almost 30 years later.