Trying to prevent people from arguing for an evil works much better when the primary reason they are arguing for said evil is because your platform makes it insanely profitable for them to do so.

"I disapprove of what you say but will do my level best to ensure it's profitable for you and your copycats to keep saying it in a more and more attention-seekingly extreme manner" sounds suspiciously like the net result is society manipulation of a different sort. Ultimately I think private organizations have a right to have the time, effort and money they invest in growing their platform's reach decoupled from the change in the public profile of evil.