While I'm leaning towards the possibility of Kanye being mentally ill, I get hung up on the fact that his descent into madness seems to have its roots following the death of his mother.
She might have been the one keeping him humble. With her gone, he's got no one telling him to chill.
People easily dismiss the role of a single mother when we think of the results they leave behind. Particularly when those results are offspring that might have mental/ emotional issues.
Remove the only voice of reason and a large part of that child's reality, and in Kanye's situation, replace it all with what? That lifestyle? Those people where posturing, lying, cheating and drama is a way of life?
Not healthy.
Either way, he's shown that he's always been an ass and completely full of himself regardless. He's dropped enough tracks about it all. Nobody should be surprised or disappointed at this point.