Full disclosure: I blew my knee out - badly - playing in a pickup game. So this is a topic near and dear to my heart. Rehab is agonizingly boring so I understand where Greg Oden is coming from and my first inclination is to defend him.
That said, here's where the Blazers are coming from:
Daniel Hackett (courtesy of OJ Mayo)
Freak things happen in pickup games, period.