At the time of the Good Friday Agreement the IRA was so riddled with paranoia that people were afraid to breath. British Intelligence has got so far inside the IRA that it was on its knees. These 'heros' were snitching each other up left right and centre but if course this never got reported.
McGuiness knew the IRA was on its arse and that Blair wanted to be famous so he grabbed the opportunity while he could.
He was a murdering shithouse. Rot In Piss