A loved one or similar type individual may be able to have a second/backup key on their person in the event of a home invasion. That way there's a layered approach but also a level of self-advocacy/self-agency in the issue, which I'd argue is the supreme thing fighting against the depression itself.
Taking away the self agency, and you might as well probabilistically condemn them to die in another way. (Though that's just my two cents from my experiences surrounding suicidality and/or other suicidal individuals).
It's emblematic of the approach to guns as a whole. We're not very concerned with why people are trying to kill themselves or others, but we're awful fired up about the tools they choose. It's crazy!
Taking away the self agency, and you might as well probabilistically condemn them to die in another way. (Though that's just my two cents from my experiences surrounding suicidality and/or other suicidal individuals).