Was someone forcing the grandparents to visit their infected grandchildren? In my own case, I didn't see my own grandmother for two years during COVID other than via Zoom/FaceTime. She has a history of bad lung infections, so none of us wanted to get her sick. This was despite her having four great-grandchildren and being a widow. When she finally got COVID this year for the first time, she developed some blood clots, but was able to pull through and now is back to great health.
I think the damage to children who were isolated from one another was much worse, and unlike the elderly, they couldn't really understand why we lived so unnaturally. If elderly people wanted to "just see their grandkids," they knew the risks and made a choice. Every death is sad, but I have a hard time thinking we should adopt harsh and even draconian measures just to protect those who ought to know better.