Our laws were crafted to protect these achievements, the exceptionalism of the individual from the government, and that of the nation from internal and external enemies
We are better than them. When all the other arguments for why we can't fight back have been exhausted this is the one that remains in the background presenting our moral exceptionalism as the reason we shouldn't fight to protect ourselves.
"Fight back? But then we'd be no better than them?" If we waterboard then we are no better than the headchoppers and mutilators. If we profile then we are no better than the genocidal jihadists. If we treat our friendly Pakistani and Saudi visitors the way they would have been treated a century ago-- then we would be guilty of being un-American.