Re: Security by obscurity, yawn
To quote from the linked article
"For the most part, the more security devices fitted to a property the lower the risk of burglary. But this is not necessarily always the case."
And regarding inmates
"Burglar alarms were mentioned as one of the risk factors they would consider."
I've seen plenty of interviews and the scenario usually is, given two identical houses, one with an alarm and one without, most would hit the one without.