If you want to make an argument that an overweight child should still be considered otherwise healthy, that would be a welcome and relevant argument, and also an interesting one.
You'd close schools to protect a minority of children with comorbidities from a virus which doesn't threaten the vast majority of children, knowing that school closures will definitely damage all children?
Umm.
(Otherwise healthy) school-age children - and younger adults - always faced a very low risk from Covid-19, and we had solid statistical data on this from at least May 2020 onwards.
Maybe we need to look at where our decision-makers get their information, and their incentives?
Much easier just to suspect an unfounded conspiracy instead.
Maybe your username should be “empathyfail”