I agree that we shouldn't close all classes, but it seems sensible to close this one class a week early.
The thing is, Covid-19 can be quite nasty as well as really benign, even for kids- one of my teens had a nasty bout, like a bad flu and has been exhausted since then, so not all children will knock it off. Same for adults.
It is a bit like flu- if half your class has flu, your TA has flu and then you get flu, you can't carry on functioning because some of you are too ill, just the way it is.
The issue isn't about it not causing death/hospitalization, it's about the fact that if you get a big outbreak in one place, then that place ends up not functioning, whether it be in a supermarket, packing factory, school or whatever, because some of the people are still quite ill! Covid can floor people for a few days...even if half the people don't get floored, 1/4 of the workforce ill at once is too many for most places to keep going.
Right now, the OP's class isn't getting taught really, half aren't there, the other half are staggering on, I'd rather have proper public health containment measures, shut the class for a week, then half term week, then back with masks on.
We have so many students/staff off right now (uni), the students didn't want to wear masks and here we all are! So predictable!