I cant work out where some of you are coming from tbh.
You knew what you were getting with keane. He'd dish it out, usually to the oppositions toughest player(s), and he'd take it right back without moaning. Sometimes he overstepped the mark, just like every central midfield hard man does at times, but he was generally pretty straight forward. If you kicked him he'd kick you back, usually a bit harder. Nothing wrong witht that, it's British football 101. He was the last in a long line of great, tough British/Irish central midfield enforcers.
RVN was a diving, play acting, 'run his studs down your knee when the ball has gone', 'leave an elbow in your face for no reason' coward. Keane was a pretty selfless team man whil Van Nistelrooy was completely selfish and consumed with his own glory.