Most car alarms, engine immobilizers, etc. can be defeated in about a minute by an expert, as shown many times by pretty much every car magazine out there. But

Most car alarms, engine immobilizers, etc. can be defeated in about a minute by an expert, as shown many times by pretty much every car magazine out there. But they are still installed because the average thief does not have this knowledge. I think the same principle is at work here.