J6 rioters were successfully found guilty of numerous things and jailed without needing to make up new offences for them. Incitement to violence is an existing crime. They should be enforcing it.
The fact that some twat who's above the law came along and freed them all doesn't play into this argument.
I don't want to live in a society where the freedom to protest is so eroded that it's worthless. So I don't want them banned from protesting because that's legal. Nail them to the wall on anything they do that's illegal though. I'm pretty sure it wouldn't be difficult.