[rm_-rf_slash]

The difference is proximity and legitimacy. One can say ISIS should be bombed but that's a matter of war, declared by one's state, and is therefore considered legitimate. It's also far different from posting "Someone should stab these immigrants down the block living in state housing."

Yes it's hypocritical and arbitrary when considering that we are all humans, but that is simply how law and society stratifies speech worthy of regulation. I don't think it's impossible at all.