It’s the children who’ve been thrown under a bus! Huge schools, no vaccines, no social distancing, left to spread a virus who knows how it could infect them? There are loads of poorly children in vast schools, yet the elderly are at home all safe and well because they’ve had their vaccines.
It's not one versus the other. Most children love their grandparents and don't want to lose them. Children aren't on their own in schools. They're with teachers and other staff.
60+ aren't playing cards at home. Many of them are working. Including in schools. Others are providing (usually free) childcare so that the children's mum and dad can work. Grandparents are increasingly essential to the economy.
Vaccines aren't 100% effective, and data from Israel suggests immunity might wane after a certain period.
Ideally we'd have enough vaccine supply to do 12+, and boosters for 50+ and CV. But i don't even know if we have enough to do all adults that need them.
Children are much lower risk than adults but I understand your concern. We should certainly be doing more to mitigate the risks (to children and adults). Even without vaccines, we should do the same as many other countries including European neighbours. Better ventilation - and the simple easy thing of masks in schools. Why we're not at the very least masking, I don't know.