We've had dozens of unvaccinated COVID cases in my center too. Most of them mild or even asymptomatic. But we also had a ~30 year driver forced into early retirement thanks to permanent complications. Wasn't quite ready to retire yet, but he just couldn't do the job anymore. Our on-road spent a week in the hospital. We currently have a 25+ year driver who has still not left the hospital. Healthy guy, hard worker, good ol' country boy. Might be it for him too. I hope not, because he's a good-natured guy who everyone likes.
Point being, the few vaccinated employees we do have are all working. The ones who "did their research", which in all likelihood consisted of scrolling through Facebook on the toilet, are the ones getting sick.