Big Tudor,
You sound dangerously close to suggesting that there is some degree of moral equivalence between rioters, petrol bombers, terrorists and the British Army, when there is none.
I have a degree of sympathy for the Bloody Sunday marchers, but had they obeyed the law, and not marched illegally, and had the IRA not used their march as 'cover' for attacks on the security forces, then no-one would have been killed. Without the paramilitaries and the hot-heads, even had the march gone ahead the worst that would have happened would have been that a few people might have been treated a little too roughly by the Paras.
And where is the proof that the IRA didn't fire first? And where is the proof that some of those shot were not engaged in petrol bombing or worse? There is no proof either way, so why do we have to believe the Republican version of events so uncritically?