Larry Fransson wrote:

So this was in New Jersey, right? The state that requires double locks on all aircraft? Uh huh. Lotta good that did. It just goes to show that locks only serve to keep honest people honest.

A standard ignition lock and locked door counts as "double locks" according to the New Jersey Division of Aeronautics. http://www.aopa.org/whatsnew/newsitems/2003/03-1-146x_faqs.html
Double locking your aircraft is only required when the aircraft is left unused for at least 24 hours. I don't know anybody who intentionally leaves their magnetos hot, and locking the door sounds
like pretty good common sense to me, especially in a place where avionic thefts have occurred.