You're extremely mistaken regarding the Korean war. The South was not the "legitimate government" of Korea, it was an American-installed dictatorship made up of collaborators from the previous Japanese occupation. The North had a much greater claim to being the legitimate government, and Kim Il Sung, having fought the Japanese rather than being a collaborator, would have won nationwide elections had the American occupation allowed them.
The 38th parallel was not an internationally recognized border, and didn't become one until after the war. It was just the demarcation between the two occupation zones. South Korea made plenty of incursions into the North before the war, it's just that the North pulled the trigger on an all-out invasion, and they had every right to do so given that half of their country was occupied by a hostile imperial power.
Nobody's "stanning" North Korea, you dolt. We're talking about history, and the history is that the United States pursued a campaign of genocidal terror-bombing against North Korea, destroying every city, town, and piece of civilian infrastructure. They used biological weapons developed by Imperial Japan's Unit 731, they doused villages full of people with napalm. It is in no way inaccurate to say that it was a war of extermination that you undertook against them. To top it off, after the armistice, you imposed a perpetual economic siege and military encirclement, in their eyes threatening to resume hostilities at any time. Is it any wonder that they would end up "sooo craaaazy and evil"? All I said was that the US went a lot crazier per building destroyed than they did.