What will you do when your plan to censor the alt-right backfires and makes the violence worse? Attempt to start rounding them up? And when that makes it even worse?
You don't have a plan, just a knee jerk impulse to censor.
It's not censorship of the entire alt-right. It's the limited censorship on certain privately-run forums of a small subset that is directly advocating for violence and attempting to tear apart society.
If they want to speak in public, they are free to. They probably won't get a warm reception.
You don't have a plan, just a knee jerk impulse to censor.