It is if they claim it. And it is the responsibility of other Muslims to condemn it. Likewise, if an American commits a similar atrocity in the name of America

It is if they claim it. And it is the responsibility of other Muslims to condemn it. Likewise, if an American commits a similar atrocity in the name of America, it is upon other Americans to condemn it. It is this act of allowing the condemnation of people with the same attribute that lets us see the terroists as what they are (as you pointed out in your post). When that _doesn't_ happen, then they are not extremists any more, but representative of said population. And it is for that reason that I think it is important to call them out. To ignore just builds up frustration on all parties, and then worse things start to happen. Ignoring them is not an option.