Would I be snarky if I said it was a sign ofa DC cop? Probably so.
I'd go more with a sign of the economic times plus so good advance recon - your neighborhood sounds to be deserted during the day - like most others in the country.
Good strike plate does wonders at keeping out intruders, as long as the screws are in deep enough. Same goes for the hinges.
Although a shoulder holster is an option wearing sweats, so is a belt. Using a shoulder holster requires lots of additional practice both on the draw and getting to the firing position. Unfortunately most ranges do not allow draw&fire from shoulder holsters.