Kim isn’t crazy. He was raised from birth believing he is the divine ruler of a people and received a modern education. He is acting in the best interests of the state he leads. It just happens that most of us on this platform likely live in a part of the world where those interests don’t make sense or are hard to see or just don’t seem important. But that’s an “us” problem.
His public persona in the West is a combination of propaganda from multiple angles, much like we see around Russia and China, too.
I’m not saying that he is a good leader or has the health of North Koreans in mind, but be aware that not everything you hear about living in North Korea is necessarily accurate (and not necessarily due to outside actors, either).