Same thing, you can't go to a bar if you aren't vaccinated, you will be a danger to yourself and others.
Given the Enormous Volume of professional discussion on these matters, what's the purpose of rehashing that question here? Do you expect an expert viral epidemiologist to jump in and provide a new angle on the discussion?
sar2[covid19] can be carried in the nasal vault by persons vaccinated or persons of naturally aquired immunity
vaccinated persons may have a breakthrough infection; or go on to spread to others.
<<If they are then what is the purpose of getting the vaccination>>
the vaccination gives you an edge on the virus from the start; meaning prompt immune response, not having to wait until an antigen is perceived in order to develop antibodies, reduced severity of illness, and squelching of viral reproductive cycling