That's a thing I never figured out: why would they ban left-wing trolls? The right-wing trolls enjoy fighting with left-wing trolls, and in my experience, they usually win. Especially when they have numbers on their side.

I had thought that what would kill them would be that those echo chambers rely on an enemy to be opposed to. Without it, they would just get bored and wander off. That's what they like about public forums such as Facebook and Twitter. They're not perfect echo chambers. They're opportunities to have their echoes amplified, then go off to fight the good fight against their dastardly foes.

Beating up on the left-wing trolls should be fun. Sure, some of the left-wing troll masquerade as right-wing trolls to throw people off, but really, it's hard to tell the difference. Poe's Law is more and more prescient.