That's Bullshit hon. This is not the store's fault. Hiring a couple of rent-a-cops to hold their hands up at them wouldn't have made a difference.
They would have been trampled along w/ the store workers.

I wouldn't be surprised if Walmart hires security now though...

In reply to this comment by ArtfulDodger:
The store should be held liable for this. They know how crazy people get over sales and yet they have no safeguards to insure an orderly entrance into the store. I hope they get sued for millions.