People are attracted to things based on their personality traits. The average software engineer is not the same as the average person, because the average person is not attracted to software engineering.

In my observations, the average software engineer is more likely to be persnickety, caught up in small details, and obsessive than the average person. We're more likely to split hairs than most people would care to, and proper labeling and categorization is much more important to us than average person.

It's not that software engineers are somehow magical or special, it's that there is a selection bias to become a software engineer. It's extra not special, because the same thing happens for virtually any specialized field. There are famous stereotypes about the personalities of psychologists, for instance.