Not particularly, WalMart isn't in the Security business. Sony should have made sure they had an infinite supply, right? Shouldn't they know that this will happen? Come on....
The only ones that are culpable are the retards who think shooting people over a game is important.
You don't have to be "in the security business" to ensure your customers are safe. When you clearly have a pattern tramplings and violence around releases they should have teh obligation to try to curb it as much as possible. If it means having a cop patrol the area so be it. If it means having a sign up list, well then so be it. Continually doing the same thing that fosters this kind of mob rule is irresponsible.