While again reiterating that Martin McGuinness's activites should not be forgiven or forgotten (or lat least if the latter then only by the victims) it is a little unfair to lay all of the woes of the troubles at the door of the IRA. The first bomb of the that era was planted by the UVF, the first RUC officer to die, also, was shot by loyalists. When the Britiah Army arrived on the streets of Derry they were welcomed, as was then Foreign Secretary Callaghan, who spoke to cheering crowds in the Bogside.
All of which is to say that it's complicated: McGuinness did not invent the IRA (his IRA in any case evolved out of a very different IRA), not did he cause the conflict, while his actions undoubtedly made it worse for a long time. so did the actions of many others. The current Ian Paisley's dad for example, sowed tension and division for decades until finally, and amazingly, he and Mr McGuinness were able to make peace together.
Had I ever lifted a finger in the cause of peace in Ireland I would feel I had a right to criticise those who risked a lot to do so.
So I am not going to :-)