The most plausible explanation is that people who know nothing are in hysterics over legally operated and licensed aircraft.
ATC has radar, military bases have radar. If there were threats, they would see them and do something about them. Folks are reporting to their state senators? and some whacky congressmen have said some absurd things, but no one who is actually responsible cares and folks are trying to spin it like they're clueless.
This is the equivalent of calling the FBI because you're a pepperpot and you saw someone you didn't recognize walking down the street.
Drones near sensitive power infrastrucure... like those transmission sites will all the equipment are all over the place. And police stations? Give me a break.
There's probably some unlicensed or amateur operators doing slightly inappropriate things, but silly people are trying to frame it like some kind of attack.
Also some of them are certainly just ordinary airplanes.
ATC and military bases only have primary radar covering a tiny fraction of US territory. Most of what people think of as radar relies on active transponders to work. Or it's ADS-B output and not radar at all.