And of course that aloofness is the natural result of having professional standards handed down that can not be defended in discussion with responsible, informed, educated citizens.
How does a cop justify lying to a suspect who is "presumed innocent" for the purpose of obtaining incriminating information? How does a cop justify mistaking a sidearm for a tazer? How does a cop justify doing otherwise actionable damage to a person or property, using intimidation and violent action under the rubric of "fearing for their personal safety?"
The short answer is: they don't. They just keep their mouths shut and continue about their business.