The message was that we had already been at war with Korea.

Citing a television series with funny and sarcastic stars and sidekicks is proof that North Korea isn't a threat, I'm sure.
N. Korea is NOT a threat to us. They are a threat to their neighbors.

Or do you think M*A*S*H* was about the US's attempts to repel a Korean invasion of California?

Perhaps YOU should read a history book and find out exactly what "threat" we were responding to in Korea.