I have to note that I don't feel a great deal of sympathy for Mel Gibson after his drunken tirade. I'm glad he apologized, but I hope he's smart enough to realize that this apology really isn't enough. On another message board, I saw someone claim that he isn't an anti-Semite because "I've seen what booze can do", but I have never yet seen booze make someone believe something they don't really believe deep down. That is what booze can do. The beliefs that Gibson is willing to openly admit to holding tend to be pretty odious in themselves, so I have no doubt that the ones he'll only let out when falling-down drunk are really foul.
That said, I'm not going to boycott Gibson's work as a filmmaker or an actor. I just don't see the point. (Of course, I'm the guy who last week noted that I won't be reading Orson Scott Card any time soon in part because his views bug me. I'm a puzzle.)
So, anyway, Mel Gibson's a lunatic and if he makes good movies I'll see them anyway. It just occurs to me that maybe in the first Lethal Weapon movie, when Martin Riggs is really a screwed-up guy, that psycho gleam in Gibson's eyes might not have totally been "acting".