Ok, say 10% fails upon launch or fails to detonate. Now you're down to 63K per side. Say each side reserves 50% for targets of opportunity, they've each launche

Ok, say 10% fails upon launch or fails to detonate. Now you're down to 63K per side. Say each side reserves 50% for targets of opportunity, they've each launched 31K warheads. Goodbye civilization. The UN reports that there are currently 580 cities in the world with populations greater than 1M. Doesn't take many warheads or launchers to wipe those out.