Do burglars wander the streets at night testing doors of random places to see if they're locked? If we put the issue to cars instead of houses, there are a lot of people who would rather have their stereo stolen than have their stereo stolen and window broken. To me most locks are more peace-of-mind security.
I just don't buy that lacking some form of security dooms you to whatever penalties the security may have protected against, if indeed any.