If an abuser is a dick 24/7 they'll never actually GET ANYONE TO BE IN A RELATIONSHIP WITH THEM in order TO abuse them. Thinking about this logically for .5 seconds would make all the "but he's nice to ME" people realize that OF COURSE HE'S NICE TO *YOU*, HE WAS NICE TO HER TOO BEFORE HE WASN'T
I have this problem with one of my exes. All our old mutual friends are still friends with him because he never did any of his abusive shit *to them*. He never did it where they could see it. His victims were the "real abusers". Not one single person left his friendship over his abuse who wasn't already on the victims' side before the abuse was revealed. Not one. It still throws me for a loop when I see people @reply him on social media or when I run into people I used to care about who are still connected to him (who often say that they miss me when we meet in this manner).
Hell, even *I* tried to defend him at first. It took him turning his tactics on me before I could finally see what his victims were saying was true. He's charming and endearing and so harmless-seeming because he's not attempting to control everyone he meets. Everyone loves him. Except those he has harmed.
I just can't trust people who try to play the "neutral party" with abusers anymore, even though I was one of them and even though I adamantly believe a person who has harmed can still redeem themselves if they show a willingness to be held accountable (and I have put my money where my mouth is and given some people a chance when they showed evidence of accountability).
Consequently I remain apart from my old communities because too many people are willing to throw their hands up, say that they weren't there so they don't know and won't "take sides", and continue to socialize with certain people because Zeus forbid they give up access to parties or events in order to take a stance and not implicitly condone or support abusers' unwillingness to be held accountable for their actions.