Facebook and Google are running into these issue due to the perceived nature of advertisers. Keep in mind that the users are the product and advertisers are the customers. Therefore, these companies believe that mainstream companies would not want their ads on the same page as something “objectionable”. For instance I’m pretty sure Coke doesn’t want their ads next to video likely to inflame large chunks of the population.
IMO, these companies attempt to walk the line between potentially offensive content (in the eye of the beholder) and exciting content that attracts users. And honestly, they suck at it, upsetting users, content creators, and advertisers.
IMO the answer is to get the advertisers to relax their standards a bit and view it as getting their message out there as opposed to “sponsoring” particular content. I’m honestly puzzled when people act as if ad’s in a venue frequented by their target demo means they actually approve of it. If we could mental De-link ads with the concept of “endorsing” content then we would all be better for it. This affects both left and right as the wingnuts automatically consider the opposing side’s view offensive and often orchestrate mass flagging efforts to game the system.