Car alarms

A minor nuisance, no doubt, but am I the only person who objects to the fact that during wind and rain hypersensitive car alarms go on in the middle of the night? After all, what is the justification for having your car alarm enabled in Jersey anyway? What evidence is there that having a car alarm deters car thieves, and how does the comfort a car alarm confers weighed up against the nuisance they create when they go off at 3 and 4 and 5am? I would be interested in knowing how easy or difficult it is to disable the thing, and whether legislation exists elsewhere to tackle this.