That's what this whole thread is about, blaming the victim. Assuming OP is true, then Bitcoinica is the victim of a theft. Everybody here is blaming Bitcoinica, not the thief.

If this is really a theft, and the thief wired money to accounts of his own, I really hope all this AML crap is for once put to good use and this asshole is caught, and forced to return everything he's stolen.
If it's not a theft*, then MtGox at least would know. I hope in this case they break the silence, otherwise they would be accomplices.

*EDIT: If it's not a theft done by a third party. Either way the costumers' money was stolen.