This is a gross distortion of the problem. Facebook has been caught actively promoting conspiracy theories and societal discord because it increases engagement (in my case it drove me from the site but the plural of anecdote is not data). Most recently it was reported that “angry” reactions were weighted five times more than “likes”.
This is not just backseat driving concerns, Facebook’s also is a major driver of our culture and societal values whether we like it or not. Nor is it Monday-morning quarterbacking, these concerns were raised by Facebook’s own employees. To let them abuse our social harmony for ad revenue is short sighted.