The airport does not have "police". The FAA is a regulating agency, not a police agency. The FAA cannot "arrest" anyone. Local law enforcement can arrest for "reckless endangerment", privacy violation or trespassing. Local law enforcement can collect information such as registration and identification and provide it to the Department of Transportation (FAA) for investigation with regard to and limited to fines and/or license suspension.
Regulatory agencies operate under restrictions and at the direction of legislation. That's basic Civics 101, which unfortunately has not been taught in schools for a long time.
Registration applies to all "drones" between .55 and 55 pounds, commercial or hobby. (Where have some of you been for the last few years?) If you think the $5 ("greedy government") registration fee covers the cost of this process you are clearly from another planet.
The story that initiated this thread amounts to propaganda at best. I've seen Swiss cheese with fewer holes than that premise. To what end and purpose I can only guess. I smell troll.