HH, you are looking at things superficially. What Kennedian mighty act will the US perform to not allow NK to shoot their missiles over people's houses -except to compromise same as Kennedy did? But that's all the US can do. KJU is no Saddam Hussein.
Morpheus pointed out that China is insidiously backing NK because it was China that gave NK the technology to begin with knowing that NK would use it against the US. Also, China has insinuated with few words that it would not allow the NK regime to collapse. Also, you are dreaming if you believe that the US will prevent NK to keep their toys. NK will keep them and promise to be nice.
Cofty pointed out that in the past when the US pushed NK too far, China got involved.
On the other hand, as Simon said, anything can happen.