I'm not as convinced your every day Muslim should be required to take collective responsibility for the actions of a few. Particularly because many of those every day Muslims are in this country fleeing exactly what we saw yesterday. There is no centralised Muslim authority, so I think you overestimate the potential impact public denouncements and protests would have on the minority.
Agree anyone using violent rhetoric should be denounced and punished, and if on visas deported. I also agree that if anyone has not reported concerns when they have a legal or moral obligation to do so, they should be punished.