Not insane at all. I’m with you on this. I grew up with my grandma, who lived with my family. She was a cool, collected, highly stable person who worked her whole life as a doctor. I guess this sounds really heavy thinking about it now, but it didn’t seem so at the time when she told me once when I was a teenager that if she ever had dimentia that I should kill her somehow. She was of course to some extent trying to articulate her feelings on the severity of the condition, but I did get the concrete sense that she was also being literally serious. Fortunately she got cancer around the same time she got dimentia, because I’m not sure I could have done it.