At that age a lot of people literally don't have the intellectual capacity to deal with this. Their brain is biologically atrophied due to illness, not exercising it anymore, not seeing or hearing well anymore (this has a huge impact), being socially isolated, etc.

They're not inventing a new world, they're not "conveniently" and consciously sweeping anything under the rug, they're not telling themselves a fairy tale. They're just losing much of the world they were living in and have to deal with what's left, holes and all. Why do you think old people are such easy targets for scams and fraud in general? Do you think only the body degrades with age?

If you're young enough to not have seen this in action ever, you'd be excused for not understanding at all what happens and for building such bad faith scenarios. Common sense and some light reading on the topic would have prevented that nonetheless.