Yep. I am having deja vu to 9/11. When here on slashdot, several commentators accurately predicted the largest fallout would be restricting our own freedoms.
Instead of limited our freedoms, how about we go kick in the teeth of anyone who doesn't support peace, anyone who promotes violence, and anyone who doesn't denounce this?
Unless there is a specific state or organization behind something, you can't really retaliate in a meaningful way.
I assume you think you know who is behind it, and that is who you want to "kick their teeth in" of without further evidence, and probably just by association rather than actual being in any way responsible. In other words you are probably proposing to become what you yourself what are denouncing. So should we kick your teeth in?