Come on, give the guy a go. He let the emotions get to him, who can say they have stepped onto a sporting field and not let the emotion get to them. For example, if a guy goes in hard and misses the ball and gets you, you would be definately pissed off, its human nature to get them back eventually. That is what Keane did, I dunt condune his actions, but for people to start calling him a sick b*astard is over the top. It you say that, you obviously havent experienced it in the heat of the battle on the sporting field, whether it be soccer or any other sport.
Give him a go, I know he has done bad before, but any one would react the way he did.