Because they do work. The article only offers one point of evidence they don't - > Indeed, one 1997 analysis found that cars with alarms “show no overall redu

Because they do work. The article only offers one point of evidence they don't - > Indeed, one 1997 analysis found that cars with alarms “show no overall reduction in theft losses.” Which I can't access, but I can access other articles that confirm car alarms do work. Even the fact insurance companies require them shows they do. I'll trust an actuary with real data, real money on the line, real money for research over one journal article any day.