I've read several places that computer programmers also have a higher incidence of PD.

We have hypothesized that the professions that are linked to a higher PD rate (teacher, clergy, software, I've never read about the nursing but it makes sense) is because very generally speaking, people in these professions are very compassionate, caring, and sensitive. I know there are lots of exceptions and we've all known or had a teacher or pastor who was a jerk, and of course Hitler was not known for his compassion and I've read he had PD, so like I said, it's just midnight musings.