Keeping them cooked up at home for years is a lot more damaging than a cold. Like immeasurably bad idea.
They never closed down schools (except for universities) in Sweden for this reason. They also never forced masks or curfews. The main thing that they did was to limit inside capacity to 50 people max for restaurants and other avenues.
There were groups of people who would protest that the government should be enforcing masks, basically full reverse of what people were protesting in all other places around the world.