@Seriouslymole of course. What you’re saying is not new.
What is new though are three things;
Firstly, the new strain. This makes schools substantially more risky places to be.
Secondly, there’s a new testing system on the way for schools. But it’s not here yet: in Tier 4 areas it makes sense to wait just slightly longer for this to be ready before sending everyone back.
Thirdly, there’s a vaccine on the way. Teachers could be part of the priority group. Again, it makes sense to wait for this before sending everyone back in T4 areas.
I’m not saying schools should stay closed forever, I’m saying prepare properly first, make the schools safer, and then reopen. Lives are at stake.