It's a thin line between genius and madman. His appreciation for Mickey Mouse just was one of those things on the genius side of the line.
I was thinking more along the lines of the Wacko Jacko side of the line. But, there does seem to be some correlation between sociopathic and psychotic tendencies and cartoons. Maybe because the sociopath sees no difference between bashing someone's head in with a cast-iron skillet in a cartoon and bashing someone's head in with a cast-iron skillet in real life. Only difference is the real persons head doesn't go flat like in the cartoons, dammit. But there is that lovely blood. Mmmmmm.... blooood.