These kinds of "you guys can't have nukes because they're bad, but we'll keep some on hand because we're responsible" disputes that the USA seems to love force me think "where are all the adults?"
Is the US perfect? No. Is it a democratic, accountable country? Largely, yes. There is no perfect system of government, and people should stop pretending that everyone is on the same moral level.
The US leveled two countries in order to assassinate someone in a third country. It wasn't held accountable at all.
You are right, morally they are not on the same level, but not the way you think they aren't.
The adults are the non-nationalist people who see the world as a global community. These people are rare in politics it seems.
Not equating North Korea or Iran with Western democracies, that's for sure.