I don’t think teachers should have to go into unsafe schools, especially those 50+. They are not NHS workers. No-one dies if schools close for a month or so.
I do think that, in the state sector, many schools did not provide adequate provision for at home learning and this has given the idea that teachers hardly worked in the first lockdown (the reality is many worked extremely hard but some did get away with very little. There is no reason not to provide face to face learning over the internet. Those without computers or internet can be supplied with devices with dongles. Children do need the routine.
For the very young (reception and Year 1), however, I do think parents have to take on the bulk of the learning. In some countries, formal schooling does not even start until 6 years old.
The government has been incredibly remiss in not funding schools to adequately deal with Covid. Most schools are out of pocket due to extra cleaning, buying products etc, on very stretched budgets. And, even where you can apply for the money back, a lot of schools are managing month to month and just don’t have the free cash.
However, there is a lot of hypocritical moaning from parents who are prepared to do nothing extra due to the pandemic, but want everyone else to go the extra mile. Teachers are having to deal with huge pressures on their MH, but suck it up to help children; I think you need to think about that when you moan about your own and your children’s MH when schools are closed. In addition, schools are on their knees economically (state schools). I am always amazed about how little PTAs raise, even in affluent areas. The state grant is, right now, not enough. So, before you moan about how lazy teachers are, transfer what you can comfortably afford (and, for many on here, that will be at least 4 figures) to your school. If even 10% of parents did that, it would be enough to provide a safer (not safe, that is impossible) environment in schools and get them open again.