Yes. They can be more powerful. They don’t have to be more powerful. One of the reasons for creating them was the ability to chose the yield at will.
Well, OK, that’s your opinion, duly noted. Frankly, I’m not enthused about lobbing a nuke back to NK, but neither you nor I get to make the decision. It’s been mentioned upthread already that there’s long been a notion that a nuke will always be answered by a nuke. I also have trouble imaging the current Commander in Chief exercising restraint in this matter. Whether or not you or I think a nuke is an *appropriate *response it’s my opinion that the most likely response to a nuclear attack on US territory would be another nuke.
Yes.
But I think governments understand the need of an attacked nation to protect itself and respond to attacks.
Personally, I think there could a big psychological victory in using conventional weaponry to flatten someone who lobbed a nuke - look, we can kick your ass without needing atomic power! It would certainly alter the mystic of atom bombs. Maybe some of these “rogue nations” will be less enthused about acquiring them if in the end it makes no difference and the US can obliterate them with conventional weaponry. (Which we probably could, if we really wanted to do so and stopped giving a damn about how others see us.)
But I don’t think any of the above get a vote if the US gets nuked.
If there’s a nuclear exchange, even a limited one, I’m not sure trade relations would be on the top of my list of concerns.
Frankly, even a purely conventional war between the US and NK would sour a lot of things.