Completely ignoring the fact that we contributed to the current situation by killing 20% of their population during the Korean War. Wonder if not doing that would have been a more effective deterrence?
https://en.wikipedia.org/wiki/Korean_War
Perhaps NK shouldn't have been the aggressor and gotten a bunch of citizens killed... How many South Koreans do you suppose would rather NK had won?
Not only was North Korea the aggressor in the Korean War, it was not the United States acting unilaterally that opposed it but the United Nations. This was one of the only times in history that the United Nations declared war on a nation acting as a clear aggressor. Had the United Nations not intervened, then we would see an entire Korean peninsula run as foolishly and cruelly as the North is.
The DPRK's mythologizing of the war has done nothing but dig the North Korean people in general and the Kim regime in particular, into an ideological hole that they can't really get out of.