Honestly, the most toxic content I've seen on FB hasn't been gore or racism or sexism or anything else distasteful, it's been blatantly false clickbait/opinion pieces that flare up existing divides.
I've always thought that the best way to make FB a decent place again would be to simply ban sharing of links, so that the feed could become what it was originally meant to be: a place where I can see what my friends are up to. But that would also mean FB would have to dial back its targeted advertisingm, which is all links (seriously, would contextual advertising really be that bad? Bad enough that we can justify the insanity that is FB data collection) and stop scooping up all the data they can get... which doesn't really seem their MO.