Who told you that “the stores refuse to press for prosecution”? Are you part of Asset Protection for a major retailer? What is your subject matter expertise here?
I have seen it. They serve the violators with a trespassing order and warn them they are subject to arrest if they return. Whether it not they enforce that, I do not know. I also know the companies that do press prosecution very often back out when it comes time to send someone to court to testify.