For some time when I lived with my family houses in my block where getting robbed. The first time mine got hit I ran after the kid (probably not even 18) with a knife. Houses all around where getting entered and things where stolen... not mine ever again. Then one day there was a shooting involving a neighbor and he got one of the thieves. Years later the neighborhood could not be any safer.

My conclusion? The best security system is a bunch of crazy ass homeowners thieves are afraid of. I guess there's a correlation somewhere with fake security systems.