I still have the feeling that the actual reason is going to be along the lines of acting on behalf of the magic bowl of oatmeal and that he died satisfied that he saved Humanity from the scourge of the angry ketchup bottles.
The reason in my opinion why he did this seems clear when you look at the photo of his dead body. He was frail. He lost a lot of weight. I would bet he had a major psychological or physical illness.