Legally, of course, FB is completely right. Morally - try to replace "white nationalism" with, say, "communism" (one can argue communists killed a lot of people, so why not?), "Christianity", "Islam", "Black separatism", "Wiccans"... I could continue forever, but I hope you get the point. If you're consistently fine with any $GROUP put there, no matter how much you love it/disgusted by it, then your position is consi…
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Ever heard of Antifa? BANM? Or maybe Red Brigades? Red Army Faction? Sendero Luminoso? BLA? Japanese Red Army? Liberation Tigers of Tamil Eelam? There were dozens, probably hundreds, violent leftist groups. I don't know if they shoot up mosques, specifically, but why this specific mode of terror is your sole concern? They certainly did shoot, blow up, hang, cut off heads, poisoned and murdered by other means many people. And that's just terrorists, wait until they get the real power of state coercion... then the count goes to millions.
You mean there's no active leftist militant group in your town right now? Good for you. You may want to familiarize yourself with recent history and wider world though, to get a bit more complete picture than the current news cycle.
Oh and btw, the guy that shot up the mosque was very concerned about the environmentalism and thought China is a model country. Should we start deplatforming environmentalists and those who like China?