The best way to keep immunocompromised and people who literally can’t take vaccines safe is by having so much herd immunity that the likelihood they a virulent load of a virus cannot get to those people.
A great way to get herd immunity is through mass vaccination.
Except herd immunity for COVID isn’t feasible or even possible. It mutates too much, the vaccines don’t confer effective enough immunity, etc.
It’s unfortunate, but it’s the reality of this disease. I’m not immunocompromised, but I still modify my behavior to try and protect myself: mask on planes, avoid certain situations, etc.
A great way to get herd immunity is through mass vaccination.