Because he's been inconsistent... great in spurts, but costing this team dearly when he's bad. He's minus for the game (on +/-) despite hang a good scoring game.
personally i think lin may be bipolar, based on which type of game he's having. the only way you can explain it. i really think one of the personalities can ball out of his mind (linsanity), then the other personality shows up and we get what we see tonight. that is the only way i can explain. many athletes have it some control it better than others.