It's why WWII vets did what they did knowing not every bomb, aircraft or handheld weapon was perfect but still ran in to stop Hitler. I would say that put a high price on human life. These last few generations won't get it until it gets its WW.
There is literally no one that can bomb the US into nothingness. Even if the US decided to stop develop new weapons, they cannot be invaded. They are too big, too rich and too protected by the ocean and weak neighbors for that