I've wondered why the most idiotic and vocal creationists in Texas were always dentists

I gather there's similar mystery about why so many of the "thousands of scientists" the deniers tout as skeptical of AGW are engineers. Engineers are of course no more qualified than any of the rest of us to judge climatological matters; but they're also (despite all the jokes when I was at university) definitely no stupider than other scientists/technologists. So why should this particular stupidity be so endemic amongst them?