Yep. Officials aren't immune to mass hysteria, and there's immense pressure to assume the worst "out of an abundance of caution."

"Having closely examined the technical data and tips from concerned citizens, we [DHS, FBI, FAA, and DoD] assess that the sightings to date include a combination of lawful commercial drones, hobbyist drones, and law enforcement drones, as well as manned fixed-wing aircraft, helicopters, and stars mistakenly reported as drones. We have not identified anything anomalous and do not assess the activity to date to present a national security or public safety risk over the civilian airspace in New Jersey or other states in the northeast."

Either they were wrong about the nature of the sightings when they happened or they were wrong afterwards, there's no world in which they got it right the whole way through. So the only question is which way they got it wrong. I see no reason to believe that they were correct in the moment and wrong afterwards.