Intention is irrelevant to the argument I presented. The example I presented merely illustrates the level of risk, which is ridiculously low, and certainly doesn't justify military involvement.

> Besides that, it's almost certainly the case that terrorism has resulted in more deaths than has warrantless dragnet surveillance of cross-border traffic.

I don't see how that's relevant one whit. We don't control terrorist actions, we do control our own government's actions, and the latter's actions are restricted by the constitution.