People Who Work With Children, But Don't Like Them

What is the deal with people who work in professions designed to cater to children and then they can't stand children and/or they have no patience with children?!

We take our kids to a pediatric dentist.  He costs us far more than a "normal" dentist because he is a specialist, but I wanted to take my kids to a dentist who supposedly wouldn't scare the shit out of them and who I assume is trained to work with the under 12 crowd.

This guy has an office that looks like a carnival.  He...