I somewhat agree with you but with a good alarm system (2 way transmitter that pages you when the alarm sounds and a good starter kill) its pretty damn hard to get the car started without knowing where the alarm is installed, finding the starter kill, disabling it and reconnecting the starter wires all before the owner gets to the car and puts a couple rounds into the thief.
Most alarms sold here are a joke thats why I brought one in from the states and want to get it installed by someone who really knows what theyre doing.