I recall in the Sheriff's interviews he always said it was a zero crime rate community, they'd never had any burglaries in a couple decades. This is one reason why he believes it wasn't random, but that the couple were targeted. The security might deter a random criminal who could find other places with less risk of getting caught. However, the security wouldn't defeat someone who was determined, and then there was no security whatever from a boat.These type of places sell buyers on the concept of security but as many posts above point out they aren’t really as secure as many residents think.
In the community I lived in, some people acted like we were 100% secured away from the “locals” outside the gates.
JMO