I know that in certain countries like Japan or South Korea: it’s normal to leave the front door unlocked since the probaility of someone breaking in is low since their crime rate isn’t high. I knew a friend of mine who resides in Korea where they even left the car unlocked with the keys inside, can you do either of those things in America?
It isn’t safe to leave your doors unlocked anywhere in the world. It’s not just a crime thing you wanna block the entrances to your house to keep animals out, To stop it from drifting open during weather event that can damage your house, To seal the house to keep vermin and pestilence out.
Being safe is such a broad term.
Idk what kind of animals or weather you are dealing with that know how to open doors.