I think it's a question of instinct, I'm sure most of us (who've played football) have swung an arm, kicked out at someone - Sometimes when the red mist comes down we react, but biting is not something that humans instinctively do (is it?) - It's animalistic and something most people can't...
FIFA can ban him from all football, given that his previous bans have been (IIRC) 7 and 10 games, given that and the profile of the game, I reckon somewhere around 3-6 months.
While I understand that he has some pyschological issues and we should consider that, it's his constant playing of the...