Twitter is not the town square since real town squares are owned by the State. They are public spaces for all and, let me point out, that you usually need a permit to speak or have a rally. So they are not that free as everyone thinks.

Twitter is more like a mall owned by a large corporation and while there is some trouble there, they will kick people off the property that are too offensive. If you try to start an insurrection at a mall, you will be kicked out and banned.

It is in Twitters and mall owners best interest to start insurrections on their properties because there will be ramifications for allowing that to happen, that is not good for business.