Most parents make rules about what’s right and what’s wrong for their children from their own experiences, from what has stood the test of time and from what they believe provides the most safety.
They wouldn’t want to have in their home someone telling their children the rules are wrong and they should determine for themselves what they want to do.
Private employers evaluate those they would hire through the qualifications needed for a certain job, through a process to determine which applicants have those qualifications and through a discernment process among those qualified as to which would make the best employees.
They wouldn’t want to have in their employ individuals who tell other employees not to follow the rules and to conduct themselves in any manner they want to.
Similarly, private colleges have standards known by students upon entry, academic achievements that must be met in order to remain a student and rules of behavior that must be followed.