You've convinced me, I get it now. It's us paying folks that need to keep the thieving riff-raff in line. As part of my moral and civic obligation to do so, I've come up with a brilliant idea to curb shoplifting as well. Say we take those door sensors that beep when someone shoplifts, and make them a more noticeable deterrent. I mean, what criminal is going to pay attention to the warning if the thing doesn't go off until they steal? Here is the plan. Reverse their operation. Every PAYING customer gets beeped at, as a clear and present warning to shoplifters that they shouldn't be stealing. It's the only way to be sure the message gets across.
//Might get an honorary FBI badge for that genius idea.