Why are we that way?

[Almost Always Right]

If the NFHS says something should be penalized because whatever situation happened, why do we choose to enforce our own set of rules? i.e. flops, Rule 10.5, etc.
I am as guilty of this as anyone and our H.S. association is really bad at enforcing certain rules and not enforcing others.
Is it because our interpretations are so different from official to official?
Is it because we want everything to go "smoothly", with no waves in the water?
Is it more about game management styles?
Why do we choose to make some rules more important than others?
Just curious
AAR