And it usually stays anonymous unless you're just the right type of a jerk that the mods decide to investigate you rather than just delete your account...
but Adams presumably paid that $5 or $10 registration fee with a credit card made out in the name of Scott Adams, and the Certified Genius never once suspected that the Metafilter mods might make the connection between "Scott Adams the new Mefite who strongly defends the Dilbert creator" and "Scott Adams, the guy who created Dilbert."
No doubt he could have afforded to get a credit card in a different name. Not that I've done it, but I understand it's easy enough and perfectly legal to go by a different name (like a "pen name") as long as you're not doing it to do fraud or something else illegal. To go with my above idea, I'd suggest "Scott Anderson" and have fun with even the mods accusing him of not being Scott Adams.
Even still, if he was "causing trouble" they could (well, they'd probably just delete the account, but if they wanted to...) ask his ISP (maybe even get a court order if needed - it probably always is thesedays) to find out who he REALLY is. THAT would be an interesting headline: "Scott Adams Trolls Internet Pretending To Be Himself." There are so many jerks online thesedays, it can be hard to distinguish between them.
That's the way it reads to me as well. Perhaps the incandescence inside his skull slightly over-heated the don't-be-a-dick filter. It happens. Poor thing.
It's good to see someone in this thread with compassion. I worked in cubicles for a few years (the same period of time I was regularly reading Dilbert), and it can just about drive one crazy.
But wait, did Adams ever actually WORK in a cubicle?
Lastly, it's not real until it's mentioned in a XKCD comic.