I don't understand. Are you saying the police departments post a lot of Youtube videos? I've not seen any.
Yes, it is against the law (no quotes) to impersonate a police officer, or an airline pilot, doctor, or barber.
Paranoia, drama, overactive imaginations, social media nonsense, and hyperbolic Youtube videos.
Prior to the implementation of RID, there were a number of people on this forum who feared that criminals using RID would track down drone pilots...