Well since he was arrested for “Disturbance/Etc at Assembly/Etc”, it would seem that you are incorrect. Maybe you meant to say, “that shouldn’t be illegal”?

Personally, if the purpose of a public forum is to allow the public to make comments on their government, I see the value in not allowing that to be disrupted, generally speaking.

You’d probably like it less if some MAGA type prevented anybody from speaking out against some anti trans bathroom bill, for example.