So how did the Japanese deal with Hiroshima & Nagasaki?
If you seen some of the pictures I have seen its horrific.Remember these were two cities that were bombed three days apart. They were able to get aid from the outside. But, if its one massive attack in a single day,involving two countries with multiple cities the infrastructure will collapse due to the massive casualties.
But there were more deaths from radiation exposure from the years after the bombings.