My aunt had Alzheimer's disease and when she reached a certain point in her psychosis I wouldn't have wanted her to have access to any guns.
It would have been worse than leaving them for a child to get at.
In the case of my grandmothers neighbor her husband was having a "good day" so she decided to let him help make lunch. He was cutting lettuce one minute and the next he was slashing at her with the knife screaming at her to get out of his house.
Reminds me of when one of my Great Aunts started suffering from rapid onset dementia. Everytime we would go over to her house, she yell "I'm gonna shoot you if you don't leave me alone!".
We giggled because she was such a prissy, southern belle and we just knew she would nevah, evah dirty her hands with a nasty ole gun ;)
When we hired a sitter for nights, she kept threatening to shoot her if she didn't leave the house. We told the sitter not to pay attention.
Great Aunt died just a few weeks later, and in cleaning up her house we found a pistol and a shotgun--- loaded and under her bed. Geez, we came thhhhhiiiiiiissssss close! ;)