Alarm systems are rediculously easy to foil, but I guess better than nothing.
One favorite trick is to wait for a thunderstorm, they will scratch off paint on a section of the car to allow a closed circut. They pop open the hood after a lightning crash (many car alarms go off by those so people ignore) and connect the battery with the car (ground). This blows the breakers and thus the power to the alarm. They can then steal whatever, or replace the breakers after disconnecting the alarm and/or hotwiring.
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