Nobody ever said online school was a perfect system.
However it is probably the only realistic choice we have right now.
Schools have a got a lot better since March at organising and doing online. Because we have experience and some skills now, where in march we had 3 days to organise a full online school. It was an impossible ask, we did our best.
Schools have not been "safe" from the start. It's 100% clear kids transmit, and they do not socially distance well. Schools cannot distance and have all kids on. It's just not possible.
So with this new variant schools are (in SE) and will be elsewhere, a massive, massive vehicle of transmission for this new variant. The NHS is creaking today. In 4 weeks time we'd be up a decidedly brown looking stream without anny means of propulsion.
Nobody wants schools shut. Teachers included. But it is our only option to keep people as safe as we can right now.