Well, in theory a smart thief could bring bypass setup's and bypass all of these switch's. They could also bring a flatbed and just load it on and haul it off.
The primary purpose of these switchs is to make it annoyingly difficult, at best, for a thief to be able to rip the car off, quickly. If their are several different types of cutoff's, then the thief has to try to figure out what or where something is switched out and then attempt to bypass that circuit. If the thief makes a guess and it still doesn't work, then he has to try to figure out if their is something else, what that something else is, how to bypass that something else and then try to bypass that something else.
By the time you get several devices, the car gets to where it's just plain not worth the hassle and they will go find a different, less high profile, time consuming issue, to rip it off. It's really more of a question of making it enough of a hassle that your car isn't worth it. It could still be stolen, no question.
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