Ever heard of giving a mouse a cookie?
If the staff lets that slide with their employees, eventually more and more things will be let go, seen as 'correct' instead of incorrect, and pretty soon the park image will become shot. Not good.
You learn through what you're told, experience, and also from what your upper management level / supervisor level doesn't correct.
Not a good practive to start IMHO. I know, I can be a strict supervisor on the Tower, but I really am a great friend too...
--Di