Wait until they get older, the state will take their money and determine the best care needed for them.
And when they die, all of the things they bought with their money, all of the pictures they've taken, all of the things that they've saved with go to who, exactly? Or will it all just wind up in a dumpster or on Ebay? In the past, a childless couple might have nieces and nephews to watch over them and to leave their things to. What happens when an only child has no children and no close relatives?