You seem to be making a few assumptions. The other half of the story could easily be that vaccinated individuals are equally likely to harbor detectable virus,

You seem to be making a few assumptions. The other half of the story could easily be that vaccinated individuals are equally likely to harbor detectable virus, I'm just pointing out that there is a big other factor to consider before we know how important vaccination is with regards to herd immunity and benefit (or risk) to one's community.