There is evidence that Kurt Cobian was an intersectionalist, and I suspect that he got radicalized into this extremist ideology by 90's third wave feminists, one of the earliest manifestations of the modern Regressive Left.
I theorize that because of his radicalization into this extremist ideology, he had become extremely depressed because of society's non compliance with Intersectionalism, which caused him to falsely believe that women and nonwhites were going to loose all their rights and did not want to live in this dystopic world that never came to pass.
At least he led by example and killed his white, rockstar privileged self. Antifa could learn a thing or two.
Checking his Early Life, on his parents' divorce "I remember feeling ashamed, for some reason. I was ashamed of my parents. I couldn't face some of my friends at school anymore, because I desperately wanted to have the classic, you know, typical family. Mother, father. I wanted that security, so I resented my parents for quite a few years because of that."
So he probably developed jealousy issues of people with a nuclear family and that jealousy led him to hatred and he spiralled into a psycho.