If you go to the police and they tell you it sounds like a personal problem, nothing bad happened.
If you go to the police and the prosecutor won't bring charges, nothing bad happened.
Everybody in the guy's circle including his family corroborates that he was like this, he did these things, had these problems...
For what, exactly?
Yeah, some of his conduct was criminal. But not every crime creates a criminal case's worth of evidence. Not every complaint is actionable.
Do they care that they got it wrong? No. Because it's about their feelings
It's not just one thing but a big part of it is having someone who is an acceptable target so they can give into all the viscerally satisfying, dark urges they want while still telling a story about how they're the good guys.
Heady stuff.