Exactly, no Americans, no Israelis involved, then anything goes.
Terrorists are fish that swim in the sea of the people. It is notoriously hard to fish a species to extinction with single line fishing. “Civilians” tolerate terrorists among them either because they support them or because they fear them. If they support them, they are not civilians. Therefore, the job of the nation opposing the terrorists must be to cause the civilians to fear the presence of terrorists more than they fear the terrorists. Only then will the terrorists be defeated. The public in the United States will not tolerate that process. Therefore, the United States is ill-suited to fighting a war against terrorists directly.