Some people literally never develop a postconventional morality. I remember developing to that stage no later than 14 years old. It's pretty strange.

I have also noticed, dissapointingly, that some people never seem to ask themseves moral questions. I think a room full of people in suits serves as a heuristic that tells them that someone else has already asked the requisite moral questions. This is partly how you end up with a city of 100,000 expats working for the government of Saudi Arabia, etc. Imagine living there. You could probably go years without anyone ever having a discussion about morality.