I make no argument against YouTube being basically a free-speech zone, and I wouldn't suggest banning people for purely ideological reasons, because I agree that that would be against the American Ideal.
That said, if I were hosting my own video-sharing website, there's no way in hell I would recommend a white-supremacist video, or even a flat-earth video. If people find it on their own, that's on them, but for the same reason that I personally wouldn't pass along flyers for thedailystormer, I wouldn't promote someone like Alex Jones.