I'd argue that, stomping on people and bum rushing a store is not, in fact, "what shoppers do".
And I agree the store manager/corporation is liable, and have said so several times. I'm in no way absolving them of any responsiblity.
But then again, I'm not absolving the people of their responsiblity in the matter either. The notion that they are blameless and without fault is flatly silly.