If teachers don't want to go back to work they should resign. Our children will progress far better in large classes with resilient teachers than the whiney eeyores that bray on here about an imagined excessive risk to teachers
From a resignation point of view, I would be careful what you wish for. If I go (and I can financially afford to), my department will be staffed by an NQT and 3 supply teachers (assuming supply can be found - shortage subject) in September. We are not the only department in school in that situation - quite a few early retirements happened and others have resigned for various reasons, including covid. Popular school, not hard to work in compared with some. We have no been able to recruit to all positions now vacant, I believe.
As for whiney and without resilience, you really have no idea what we are facing. There will be teacher and school staff deaths as a result of this.
Big classes? Again, be careful what you wish for. They have set it up with year group bubbles so children can be taught in groups of 240 if needs be in halls, sports halls, theatre spaces. That will do wonders for keeping the R rate down, don't it?
And you do realise that every teenager that gets infected as a result of interactions in school will walk it out into the community at the end of the day? It could be your family that faces long-term issues as a result.