But what if this kind of terrorist attacks actively seeks retribution? What if the attackers wanted to "stir the pot", to encourage violence against all Muslims as a way to legitimize their own role? "See how the infidels hate you? That's why we must continue our attacks".

In this sense, what does "disallowing violent revolutionary ideas" even mean? Attacking countries suspected of hosting Muslim terrorist groups? Interning suspects in illegal detention camps? Drone strikes? What other ways are there of "disallowing" violent ideas?

What if this is not about an abstract principle of freedom of expression (or lack thereof) but about not doing precisely what the terrorists want?