If you were in a region with Ebola you would wash hands, wear a mask and more. And for 300k dead Americans, this essentially was Ebola. Right now is a once in a hundred year event where the whole world has to endure this pandemic. These are temporary steps that no one takes lightly to make the future better.
Who are you to say a grandparent is not enjoying the best years of their life seeing their children raise children, or a great grandparent for that matter? And, children may well enjoy sharing the experience of parenthood with their parents, so the premature loss of one life can hurt many people.
Your whole take is based on a bunch of assumptions that everyone is miserable towards the end of their lives, that children and community feel no loss when elders die, and that just is not true. Life takes on a different meaning as we grow, and no age is of less worth.
Again, who are you to make such assumptions? You don't know the ongoings of other peoples' lives or how they feel.