He claims he was defending his family. The NBA claims they took that into account, suspending Antonio Davis for five games.

“We have made it plain to our players and our fans that players may not enter the spectator stands, no matter the provocation, and that violations of this policy will be treated with the utmost seriousness,” Jackson said. “We have concluded, however, that Antonio’s actions were the result of his belief that his family members required his immediate assistance, and have taken those mitigating circumstances into account in setting the length of the suspension.”

I think the suspension is too long, given the circumstances. He didn’t throw any punches, he didn’t attempt to hurt anyone in any discernable manner. He thought his wife was in trouble and he went into the stands to defend her.