Look here mate, you and I both know there’s probably no empirical evidence whatsoever about this. It’s a heuristic based on observations of how law enforcement works and what people choose to post on the Internet. This is like how people post a picture of a deformed boxed pie they bought at the grocery store to complain about it and then you assume that all pies are deformed. No, people only post the bad ones online to complain about it, but if I were to assert that “at least 80% of pies are fine and not deformed” and you choose to reply with “Where do these numbers come from? internet magic?”, I think you can see the inherent ridiculousness of that reasoning.

I really hate that on the Internet you really have to explain to people that the things they see posted there are almost always the exceptions rather than the rule.