What is the idiom for a situation that "If people-in-authority don't follow their own set rules, then what can one expect from rest of us" in similar examples given below in different settings:
When HR themselves are tardy, undisciplined then what can you expect from the employees (punctuality and discipline)?
When traffic police themselves are offending (driving without belts, smoking while driving) what can you expect from the vehicle driving community in the city?
When parents themselves are undisciplined (smoking in front of children), what can you expect from the children themselves?
When the management is insincere, what can you expect from their staff?
If Johnny jumped off a cliff, would you jump too?.... or
Monkey see, monkey do! Don't be a monkey!