I'm not convinced though that developing countries are actually lower compliance but that's what the OP means.
They aren't, and there is far less opportunity to escape compliance. Deviation is an exclusive privilege of the prevailing strong men. Everyone else tows the community line and occupies their time scrutinizing precisely how well others are towing it as well. The romantic fiction that there is some great liberty in such places is a form of noble savage fantasy that emerges among those that have fully inculcated the contempt for their own culture they were trained to have.
In a lot of ways, it is more tolerant of faults, because developed word demands perfection.
But then, when it turns bad it can be really bad. And it is not tolerant of everything, many freedoms and choices acceptable in developed word are treated with massive hostility.
Maybe it's even possible to think of this on a class level? Certain upper middle class societies being very strict about how you should organize your life to conform.
My guess is that the relative anonymity of the urban masses affords more opportunities to avoid social opprobrium.