He takes the easy way out on the war theory: It would be awful, of course, so let's not think about it. But think about it. Would historical WWII be possible in today's United States? Introduce the draft and send current US population off to die in Europe? I think you'd see intense levels of political resistance, draft dodging and desertion in the field. Fragmentation means you probably can't unite the whole country…
Also recall that prior to WWII there were "intense levels of political resistance" but as soon as our territory was directly attacked that changed. (It took 4 days from Pearl Harbor to our declaration of war)