I guess it comes down to whether your beef is with the corporation or the employees.
I take a dim view of authoritarian fascist nazi wannabes. It's best they be consigned to wannabe status (or worse) in perpetuity.
On the other hand, I'd be willing to let the stockholders of WMT off with a relative wrist-slap for being stupid enough to invest in a company stupid enough to hire the like of this story.
It's instructive to compare Ms Garcia's experience to my own recent interaction with United Airlines. United lost my checked bag on a recent flight through their main hub at Chicago's O'Hare. Seems the computer was down in Chicago during the layover (which was extended 1.5 hours due to the outgoing flight crew not arriving on schedule). It took them seven days to get my bag to me. But all the UAL people I interacted with were very nice, tried to be helpful, and were apologetic in their impotence. Therefore, if I were to bother to sue UAL, it would be solely to take a bite out of the corporate hide, not to punish individual members of a dysfunctional organization.