I'm probably "careless," but I refuse to be scared/worried/upset or whatever about safety here in TV.
Back home (St. Louis), I wouldn't think of leaving any door or window unlocked, ever. I did seriously consider ADT or a similar installation, but abandoned that when my neighbor's system set off very high-decibel warnings six times in one day - all because big trucks were passing our houses, thereby shaking his alarm's sensor(s)!
Yes, I keep my front door here locked at all times. And, the garage door down, except maybe for the few minutes it takes me to go to the Postal Station and back. But, my gut tells me The Villages is, overall, safe.
Avoid paranoia! It'll disrupt your lifestyle something fierce!
SWR