I almost feel like they intended to have a running theme of the show be that he's essentially a 10-year-old boy mentally, which would explain how fucking retarded he is about EVERY SINGLE THING, but then someone came through and cut every reference to that storyline out. Because you can see a few times where they kind of mention it, and he definitely acts that way almost the entire series, but they don't use it enough and don't offer any other explanation for why he's fucking retarded. I know we were supposed to pick up on this a little, but it clearly isn't the main reason he's so dumb. I don't know what that reason is, but it isn't because he is mentally a child.