god, rich people really are bad at crimes. you see columbo and you're like damn, no one is THAT bad at getting away with murder, and then you read about real life murder cases and you're like damn. guess they are.
it could be that police are incapable of solving anything but stupid crimes and we don't get to read about any of the reasonably clever ones because they got away with it so completely
There are so many Columbo episodes where the killer would have gotten away with it if he'd just said "No, talk to my lawyer" instead of following Columbo around trying to throw him off the trail
