Trolls can always take over unmoderated forums because while they can drive the reasonable users out by reducing the signal to noise ratio down to a useless level, the reasonable users have no power drive them out. It's a completely imbalanced power dynamic. All forums need some sort of moderation or they will always collapse once they grow beyond a fairly modest threshold.

Nothing has more of a "Whoever fights monsters ..." vibe than the endless fixation on Nazis. I suppose we will have to amend the Four Horsemen of the Infoacalypse from "drug-dealers, money-launderers, terrorists, and pedophiles." My vote is that we put "Nazis" in place of "terrorists," given that a well-known anti-DDoS service decided to revoke protections for Stormfront while still providing services at the time to ISIS. Yes, that ISIS, the slow-motion, lovingly filmed execution of infidels ISIS.

Because it never stops at just filtering out the Nazis.