> If men, armed with guns and explosives, kill scores of civilians and injure hundreds more in the name of a particular ideology what are we supposed to actually do?

What we're supposed to do is distinguish them from non-violent people claiming the same named ideology and focus response and condemnation on the murderers, not the community claiming the ideology that the terrorists are trying to target and recruit from with the idea that an apocalyptic existential struggle is in progress between the named ideology and the rest of the world.

Because when you do conflate the terrorists with the named ideology that hundreds of millions of people who aren't terrorists claim and target your response against that community rather than distinguishing the terrorists from that community and targeting the terrorists, you validate the terrorist propaganda, and make the people that the terrorists want to be your enemies into your enemies.