This could happen to anyone... anyone less aware of the laws about concealed carry than we are, that is.
I knew a guy with a carry permit down in Middletown -- smart guy, not a flake or anything -- and he told me one day how he was in Brooklyn with his gun under the seat. I informed him that it was a felony... he was shocked!
I agree that he's an genius, but the real scandal here is that New York City (and the NJSSR, and the People's Republic of Maryland, etc.) can invalidate our Second Amendment rights.
(Disclosure: My wife and I support OWS, but we stay far away from Occupy Delaware events and protests... because we're not going to attend a protest armed, and we're always armed).