Ian Paisley was instrumental in the "troubles" escalating from civil unrest to all out sectarian slaughter. He co-founded loyalist paramilitary groups, armed them, organised them and called for them to robustly defend themselves against an exaggerated IRA threat that didnt really exist at that time.
He has also been implicated in planning/calling for a series of bombings which, although carried by loyalist paramilitaries, were actually blamed on the IRA, bombings which led to a massive increase in the level of violence in NI. Given the timing of his actions it could be argued that he has far more "blood on his hands" than any other single person involved with the troubles. But what else would you expect from a religious nut case. Putting it mildly, he behaved in exactly the same way as todays ultra extremist muslim clerics. Putting it bluntly he was an active player.
And no, I wont be linking to a website to back my story up, the info is there if you care to look for it.