What's the "big difference" that you take issue with? IMO it's just as good an argument that children and their activities don't affect adults and covid mortal

What's the "big difference" that you take issue with? IMO it's just as good an argument that children and their activities don't affect adults and covid mortality, so by extension opening schools shouldn't be a problem. Sure, closing schools may "slow the spread", but what does that matter among a population that is ultimately very safe from the effects of covid?