I honestly disagree strongly with this viewpoint. Though from a strictly American (or whatever nationality one belongs to), this is a victory, it still does not bring peace. Yes, you have ended a threat to your nation, but you have accomplished that task through the murder of everyone involved. Their families will be heartbroken, their friends will be enraged, and there will be no lasting peace.
You can't think of war just as a matter of us and them. Every single one of the actors in a war is a human being, and that has to be remembered, no matter how misguided, radical, or violent they may be. Though war is sometimes necessary, you can't view it as a cleansing force. However you frame it, killing people is killing people, and just because we do it for a "good" cause, doesn't mean it brings peace.