On italy they only opened schools for children in age groups for which having them at home would be a major burden for working parents (either work from home or essential workers).
Arguably this reduced the pain, while also reducing the effectiveness of the lockdown measures. It's a fine balancing act. It's hard to compute precisely, we're not yet good at it as a society. That said, expecting people to work while having children at home and at the same expecting grandparents to stay isolated, puts people on a very tough spot. How do people cope with that in places that kindergartens are still closed?
