>it might be good to have that as context
But is this really a matter of something your neighbors need to know? Unless the person is acting irrationally, recklessly, or endangering others right in front of you, whether or not they have a gun is not more important than knowing if they have a lead pipe, a car, or a can of gas and a match. Whether or not someone has a gun in their house doesn't matter nearly as much as if they had one in their pocket.
Where it really comes through is that the police know. If the person is acting in a manner that makes you fear for you life enough to question if they own a gun, that's the point where you step out of their lives and let the police step in. I would rather not have my neighbors call the police saying "freehunter is acting odd and he has a gun!" unless I'm currently holding that gun in my hand.
Maybe instead of a map showing where gun owners live, we should have a map showing where mentally unstable people live. They're potentially dangerous with or without a firearm. A gun always needs someone to pull the trigger, a person doesn't need weapons to cause harm.