Youtube is the problem. Anyone can put whatever shit they want online, which is fine in itself, but put your snake oil on Youtube and Google's Skynet will expertly find rubes to sell for you and show it to them.
But on a few occasions, like this one, advertisers get nervous.
Maybe! The real problem is to help people avoid people they want to avoid, not banning clients on technical grounds. A genuine attempt at solving the problem wouldn't be based on universal bans. There could be groups who have their own blacklists. Find the groups you agree with and tick boxes to subscribe to their ideas of who should be banned.