Kim Jong Un is a man who doesn't know any better. He is a man who grew coddled and brain washed into his position. He should be pitied, not reviled. Killing Kim Jong Un would just make it harder for the people of PRNK and they would replace him with someone probably worse. The man who kidnapped the girls in Cleveland wasn't evil, if anything he had to mental health issues. I have no idea what his story was, but it was incredibly fucked up.
"Evil" is an old fashioned manner of throwing people in a box. The definitions of what's evil changes from generation to generation. Everything is apparently evil, thus nothing is evil.
A lot of innocent lives could be have saved, but a lot of lives that make up the world today wouldn't exist. The past is the past. Let it go.