This isn't ostracization. At best this does nothing, at worst this makes him more bitter and withdrawn into his, frankly abhorrent, bubble. I am not saying that this is solvable with "the power of friendship", I am not delusional, but the more bitter he is, the harder he will fight.
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As it were, I also care about maintaining morals and bullying is not compatible with that. I would not be comfortable bending that for something I see as completely ineffective on a rational level.
-Protesting. The US is extremely weak in this regard. We have here a party in Germany that is less extreme than the republican one and still drew 4 Million people to protests without even being elected. AFAIK the current protests don't even beat that, despite 4x the population.
-Violence. I know that is easy to say and I think I wouldn't, but violence is sometimes an answer.