The chances of actually being able to bring people up on charges for their participation is slim to none, I agree.
Doesn't mean some effort shouldn't be put into seeing if it can be done.
It's really easy to blame the corporation, especially since it's everybody's fav target Wall-Mart. Don't get me wrong, they are most definitely part of the blame and should be punished. Sue away. All of those stores who set up the stampede scanario are playing with fire. But at the same time it's really easy to place the blame on the big bad evil corporation and overlook that there were a bunch of lug-nuts who actually stomped people to death to get something on sale and save a few bucks. Just because the store had the sale and allowed the situation to develop doesn't mean the shoppers are obligated to trample others to death.
Blame on the store for setting up the dangerous situation and blame on the idiots who took place in the dash for the cash.
There is culpability on both sides.