Blame the victim is never a good argument.
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 I'm holding $100 that is yours and I get robbed, I'm the victim if I pay you back your $100 out of my own money. But if I say to you, "sorry buddy, your $100 is gone, I got robbed", then *you* are the victim.
Unless Bitcoinica repays depositors from their own funds, Bitcoinca is not the victim of the theft. The depositors are. It was their money that was stolen, not Bitcoinica's.
The victim is whoever ultimately suffers the loss.