That isn't entirely the reason, it plays a part yes. and yes he is much worse than Mourinho, given as Mourinho never was a professional player and when Lennon was he was a hatchet, he was one of the most dirtiest players i've seen, when he joined Wycombe Wanderers to end his career, the fans here didn't want him because of his reputation as been a dirty player who goads opposition players and fans. Isn't he also a wife beater?
He needs 24 hour protection he says, but doesn't he still go out and get drunk every weekend shouting abuse to people with his two bodyguards?
As a player, he also abused Rangers players, calling them 'orange bastards'
http://www.youtube.com/watch?v=1EIpwn3DuuI and there's accusation he called Diouf a 'n*gger'.
He accuses teams of laying down for Rangers, basically accusing them of cheating with no evidence, then tries to retract his comments with piss poor reasoning.
The man is a total faggot, he doesn't deserve death threats, or bombs or anything like that but he is far from a saint, far from the whole Celtic argument of "Everyone hates us because he's catholic".
I never understood the level of violence directed towards him, as its pathetic people go to those lengths but he needs to calm down himself, he celebrated infront of the Hearts fan for about a minute after Celtic's first goal.