OP, of course they play. They have mostly been outside. They still play ball games and races and all sorts. They are spaced out in the classroom but mine haven't been doing and work in school, just arts and crafts so not 'sat at a desk a lone all day'. I don't expect the social distance between kids to be maintained at all times despite them doing their best, and I really am not in the least bothered. My kids are at greater risk of me giving them the virus since I work with positive patients; rather than running too close to a child who may be infected.
As I said in my previous post, parents who send kids in have to accept the risk. However teachers should not have to and should be allowed to protect themselves. If that means wearing a mask when needing to be in close proximity to kids, then that is ok with me.
I completely misunderstood your perspective to be honest, I thought you live in Sweden. You mention Sweden and the US in your title but actually you live in neither country, is that correct? The video is actually from Canada, not Sweden or the US? I think you are getting yourself tied up in knots unnecessarily here, you really need to see how things are going to look in the country that you live in. If it is the UK, no one knows yet how it will look.