The history of the Korean War is not complex. One side clearly started it, was clearly the aggressor (with huge aid from the USSR and China). Your last sentence clearly shows a bias that makes you ignore the basic facts.
Rhee was a piece of shit but if you use him as justification for the Korean War then you certainly then must want some one to take out the 70+ year old NK regime for all the shit they have done to their own people. But I suspect that since they are not aligned with the US nothing they do bothers you.
Nope, sorry, but you evidently do not appreciate the actual origins of the Korean War. In fact, it was a similar naive and arrogant understanding by American policymakers towards the history of Korea that has snowballed into the nuclear stand-off we have today. One side clearly started it? The Korean War was made inevitable once America unilaterally and arbitrarily divided Korea. Once America installed Rhee's regime and saturated it with Japanese collaborators, it was only a case of who would fire the first shot, and when. Who did fire the first shot? Well, you'd say when the North invaded, but a reasonable person could point to the fact that Rhee's regime and the US military murdered 200,000 civilians from 1945-1948 for being 'communists' - these 'communists' were largely peasants who just wanted more rights, yet fell victim to senseless counterinsurgency campaigns. Rhee was gagging for war, precisely because he knew America would back him, and was aiming to provoke the North, who for their part were more than willing to oblige.
Yes, I'd love someone to install a humanitarian regime in North Korea today for what they have done to their own people. And using the same rationale, I'd love someone to install a humanitarian regime in Washington for all the shit they have done to their own people, and those of other nations.