Punishing bad people is great at all, but with no accountability you're going to punish a lot of nonbad people too.

There's nothing stopping people that have your phone number from posting "He raped me" or "He beat me up" just because they don't like you or because they'll get your job when you get fired. And since it's usually really hard to prove that you have never ever done X, an innocent person basically has no better way to defend oneself than a guilty person.