Originally Posted by
cjblair
The security system won't stop thieves, but it's a mitigation tool. If there's no alarm, they can - in theory - close the door behind them, spend all day packing up valuable stuff, then back a truck up to the garage and load a shitload of things. Maybe even make multiple trips if you're gone for the weekend.
If an alarm starts going off, it forces them to get in/out because they know people will come looking, or at least take notice that something is not right (nosy neighbours probably sooner than cops).