It works, but the unvaccinated are taking up valuable health resources (beds, ICU, general care) and provide a continued breeding ground for the virus to spread and potentially mutate. They also put into danger all of those people who are unable to be vaccinated (as opposed to those who refuse).
Nothing wrong with McD’s as a job. Was my first one, taught me a lot. Now I’m a professional software tester for systems that go into space.