Well, for about ten years I lived in a place that was very near to what was the most dangerous neighborhood in Lisbon at the time. It was four different houses in one, with one family per home. Of those homes, only one had extensive burglary protection, with whatever was considered very good security at the time. Bear in mind that these families (including mine) had all similarly high incomes. Of these four houses only the one with all the security was robbed, and several times at that. The other places weren't ever touched, over a period of about 10 years.