If assume the goal of the US administration is to really limit the weapons of mass destruction

then why the previous peacefull attempts were thrown out? I remember Iran agreed to limit the production or ivite the people to watch their actions, the US sanctions were even lifted in 2015. But then later reiplemented by the US for some reason.

unrelated to all of this, I don't understand what's the problem is with a country developing nuclear weapons. US can nuke Iran with ICBMs anyway if they try to use them?