I'd listen to "experts" such as Petraeus less -- their salaries depend upon them not understanding a lot of things.

Now, your mother or some random person X might not be able to eloquently compare the merits of pacifism vs realpolitik, but tons of average persons have good arguments, grounded in reality.

Even more so if those persons are not in some US state that had no contact with war and global politics since forever (aside from some local poor people getting into the army), but e.g. from countries that had actual first hand experience with neighborhood countries, foreign invasions, etc, and have a pragmatic understanding about those things.