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I think I read this in Hot Rod magazine many years ago. If you want to steal a car with an alarm, go past the car every morning at some awful hour, whap it with a rolled up newspaper (or do whatever is necessary) to trigger the alarm, and keep moving. Maybe do it more than once a night sometimes. Eventually the owner will turn the alarm off, either from personal annoyance or pressure from neighbors.
The next time you whap it with a newspaper and the alarm doesn't go off, you break in and steal it. And if any neighbors happen to be watching you do it, they probably won't call the cops.