Should ISIS be taken off the internet? What the heck does that even mean? Do people wear badges saying "I'm a member of ISIS, don't listen to me?"
I should hope not. The labels we put on people are probably not the same labels they put on themselves. Sticking people in boxes and beating the hell out of the boxes may feel good from the outside...but it sure sucks if you get stuck in the box and didn't want to be there.
So instead of this simplistic labeling of folks, how about we act based on behavior? That is, you're welcome to blow off steam all you want. Let's say I hate clowns (I do not. I love clowns.) I might get online and say something like "Those damned clowns! We should shoot every one of them!"
Now even if I were a clown-hater (I am not), this is not a call for violence. It's an angry person making poor word choices. If, however, I got online and started asking people to take action "Meet me down next to the circus in an hour...bring your water guns!" then I am no longer just talking.
America is fine with people just talking, and in the most hateful way imaginable. We are not fine with people encouraging or planning out violence. No matter what some idiot will tell you on the internet, we assuredly did not fight the Nazis in WWII. We fought Nazi Germany. Many of those same Nazis we fought stayed in power (after being vetted as being non-violent). Many of those same men who fought Nazi Germany came home to be policemen, protecting American Nazis while they marched in the streets saying all sorts of vile and hateful things. We're like that.
We're like that because we watched country after country go down the other route, where the government decided what was okay or not to say. It never ends well. In fact, it usually results in even more violence. You don't get rid of sick people by putting a muzzle on them. Get them out in the public square where they can engage with the rest of us. Who knows? Maybe some can be helped. That would be the best outcome, wouldn't it? To create a path for people who are angry and prone to violence (but haven't done anything wrong yet) to get better and become a productive member of society?