There is a deli I go to. Seven or eight years ago, the two shopkeepers there were just the nicest people you've ever met. They were doing well and started staying open 24 hours (which I swear I just knew was going to be a big mistake, considering that it's out of the way). Sure enough, one night, there was an armed robbery. One of the guys is shot. He later died in the hospital.
Never caught the perps. Other stories I know.
So it's nearly impossible for me to feel bad when I read these stories about such perps getting the same crap back that they are dishing out.