This is my guess. I don't care what anyone says, oddly I always thought Jessica Simpson was probaly smart, and either her stupidity is 'publicity' in a way, or as the article said the show was edited like that. Much like most shows..they edited how they want, RW being an example, and they could make a person seem comletely different.
Now don't get me wrong..I'm sure she's no genius. But I do belive she's the kind of person with no common sense, but book sense, as the quoted post says..