High altitude EMP attack at 2 or 3 locations across the U.S. credible analyses predict up to 90% deaths in a year or two. You are blasted back to the 1700s in an instant. No power, no water, no sewage, no fuel, no heating, no cooling, no pharmaceuticals, no transportation, no machines to farm land, no trucks,or rail to deliver food. No control systems in factories, refineries, transportation systems. No hope of rebuilding electrical transformers for a few years.
Read “One Second After” and “One Year After” for a glimpse.
There is no need to think about hundreds of nukes delivered to cities.
You are right on. It’s amazing that some still deny the possibilities.