At least he's aware of how many MILLIONS of lives (on both sides) his Author Appeal AU would cost if it had really happened that way, yes.
Same reason I have trouble getting into the Crimson Skies background. In order to make the United States fertile ground for Air Pirate Adventures in the 20s and 30s, you have to break it up (with a second and probably unreasonably bloodless civil war). Grand fun, yes... but ten years later, what happens when the lights start going out all over Europe? Will England be able to hold out alone until Hitler gets around to stabbing Stalin in the back? (Probably not.) Will there be time to complete the Final Solution? And when it's all over, who winds up with the Bomb(s)?