Don't start the war, or your female childhood friend(protect muh gurls), who is for some reason* in the military, will be raped -- solid argument, will work for manga reading NEETs, but not for power hungry ambitious psychopaths. Like he can't just offer her employment in the revolting armed forces, or just marry her with a resignation afterwards, and carry on with the plan.
*we know the reason, everything should be a cute girl in manga, even military equipment is a cute girl sometimes