Any rogue faction than uses nuclear arms (they may have 1 or 2) against the US can be assured their cause will not survive.
For the peacenicks, The policy of MAD has been around for 50 years, might be more. No one has died. Perhaps millions have lived. If you don't remember the 60's...
either you where there ... or most likely you weren't.
We've planted our own seeds of need. We can shoot down missiles. The Russians are getting close. The Chinese are working on it.
The plants aren't for more weapons, just new ones.
The sometimes more than slightly crazed world governments have managed not to start a nuclear war in the past 60 years. Though I admit they came close at times. Effective deterrents are important.
The disarm at all costs idiots fail to understand the US can't afford a nuclear war. It would destroy the economy, period. US nuclear weapons are only a second strike weapon. But, for that to work, the second strike has to be decisive, at least in the eyes of an aggressor. But good bet the test needs to be real.