The reason for closing schools and enacting these difficult rules isn't to protect the children themselves.

Children easily carry and pass on diseases amongst themselves, which pass on to parents/siblings, which passes on to communities at large. https://twitter.com/KirstieMAllsopp/status/1260461660009115648

This entire argument "It doesn't protect the people who are made to do this" is why it's so hard to enact any measures in this outbreak.