http://www.autoblog.com/2007/01/19/mazda3-may-be-vulnerable-to-break-ins/
hey lazy if your bro doesn't already know of this make sure he does asap.. especially if he ever wants to come visit you at your new place...
All cars are vulnerable to smart thieves with master keys and hammers. But yeah, this sorta sucks that a single thump unlocks the door... That obviously wasn't tested. They should hire the people that get caught in bait cars to try out pre-release designs.
No tool and nearly no visible damage make for a very easy spontaneous crime. Popping windows and locks gets attention.