> if they weren't here, another one will take their place

This is a cop-out. Hateful false information, with violent consequences, is being spread by a company profiting from its distribution.

We don’t say, in the event of food poisoning, “we can’t blame the restaurant because if they weren’t here someone else would be poisoning people.” We fine the business and send a message to the industry that said behaviour is unacceptable.

Facebook is contributing to and profiting from atrocities. That rightfully merits scrutiny, of Facebook and ad-driven social media companies generally.