Each level in kohlberg's theory of the development of moral reasoning is based on the degree to which:

I believe the answer is: conforms to conventional standards of society.

For example, in step 4 of Kohlberg's development, we are expected to understand and accepyt the abstract normative system in society as a sign of maturation.

But, in many cases, someone who see the absurdity in the in the system and rejected could belong in similar stage as well, they just have different opinion.