Nothing will stop a smash and grab, from the inception of residential security systems and their real first generation installs in the 70's (and I know there were ones well before that, I've serviced the old Mccullough loop and tabletop ADT systems from back in the 40's and 50's). The bigger issue is complacency and people not being security minded.....not many people install a good fire rated safe in their house, on a ground floor and bolted down, let alone connected to an alarm system. Same as leaving out sensitive documents and items.