Revelation of Doom

I'm starting to get paranoid.  One of my co workers who sort of reports to me acts so stupid that I fear that he must be doing it on purpose, because if he is not, he is too stupid to live. I work in what seems like a very corporate environment – a lot like the jobs you see on TV where everyone sits in a cubicle and is quiet, and since this guy who's acting stupid and helpless reports to me, sort of, I can't just ask, “Are you doing this on purpose?”  He could tell my supervisor I was making fun of him.  Another subordinate (subnormal) coworker did that.  Nothing came of it, but in this economy, I don't want to take those kind of chances.  In the old days, I didn't care.  I once burned a cross at a coworkers desk – a real high point of my work life.  If he's fucking with me, he's a genius.  But what are the chances that there's a genius in the cubicle next to mine?

Just some examples of his dumbness:

Every day he asks me the same questions.  I look in his eyes, and am convinced that he doesn't know the answer.  It's as if his mind erases everything in his mind so that every day is his 2nd day.

Almost every week he fouls up his time sheet, and emails me saying that his, “Sign in didn't register,” trying to blame the computer.  Or he calls the time sheet program by the wrong name.  Then he writes, “My Bad.”  Who else could be responsible?

Once he emailed me this, “I was with hope that working harder could use a tip.”  I wrote back “Help," and he never responded.

I could go on.  Instead writing this squeezed a revelation out of me – a sad one.  I work in a place where somebody like that is A-OKAY.  Conversely, I probably need a harder job.  But what do I know, I'm just one guy?