I leave my door unlocked when I go to sleep, not everywhere is a ghetto.
Yep, the chances of someone breaking into your home are not all that high, but about 100 times greater than your chances of ever being in the middle of a terrorist attack or 1000 times greater than being struck by lightning.
I lock my doors at night, have security cameras, an alarm system, a dog and am well armed. I live way out in the country though and have thankfully only had to deal with 2 thieves and a drunk who insisted my place was his grandmothers house.
Ever had anything stolen from you?