Did you ever inquire about her reasoning behind it? If she can get a gun, the robbers most definitely can get a gun, I’m not sure if that makes in any safer.

If I had to pick between me and the robber being armed or both of us being unarmed I'd go for the later.

The first time I got robbed. Probably the second. By the third or fourth time though I'd be leaning more towards needing that to stop and less towards the worry about needing to shoot someone over a stolen T.V. or getting shot in turn.

Gun ownership is generally illegal in Japan. It was probably just a trauma response.

What if she's an old lady in a wheelchair? A gun is a power equalizer.