It's absolutely insane how indifferent some older people are to the risks of covid-19. Cognitive decline is a real thing but with covid-19, it's like they have lost their minds.
Older people aren't insane, they have different priorities. Some would prefer to see their grandchildren today because they know they might drop dead of a stroke tomorrow. There is more to life than avoiding death.
Or they'd rather take a chance to see their loved ones, rather than be safe and isolated.