Don't be ridiculous. The employer has never been liable when anyone gets sick.
You get injured at work, sure. You catch the flu, forget it. How can you prove they didn't catch it outside the office? YOU CAN'T.
My workplace has a sign on the door that says they are not responsible if you get COVID. I think it's absurd, but there it is.
"the fully vaccinated will continue to wear masks because they are afraid of the un-vaccinated"
UH, DOES THE VACCINE WORK OR NOT?
The vaccine does work. No vaccine ever has been 100% effective.