Teaching unions and teachers didn't want schools closed, they wanted what was felt by all to be proper protection- including ventilation, masks, PPE etc. Perhaps, at a later date, it was proved that these were not necessary but, certainly at the initial outbreak and before vaccines, it was the only protection available and schools just wanted to be able to purchase the, without bankrupting the school.
It was the government that decided schools should open to key workers, they set the parameters and the conditions that had to be met.
If your husband didn't provide a proper education, shame on him and his colleagues. We provided full online teaching from 8.45 to 3.15 to all children, those in school and at home, we sourced laptops and computers from local companies and charities and provided them to families without, before the government got its arse into gear and provided more, we delivered free school meals to homes, we checked daily on every child who didn't log into lessons, our 1:1 staff sat in children's gardens to ensure they had a familiar face to speak to.
Yes, things were done that, in hindsight probably weren't needed, but no one really knew at the time and the VAST majority of people, both in school and outside did what was felt to be in the best interests of all.