This new Washington Post article puts it into perspective:
Yes, let up put things in perspective. Good idea. Imagine the situation is reversed. Adults seldom seldom get seriously ill, but 20% of patients under 18 die. No one would say: "Let the adults go back to work. Let them crowd in hallways without mask. There is practically no chance they will get seriously ill or die. Only about 100 people over 18 have died. So what if 200,000 children are dead?"
Those Georgia high school kids crowded into hallways without masks may not have been risking their own lives, but they were risking the lives of their teachers, parents and grandparents.