Perhaps, it’s because the unvaccinated may be using Quercetin/zinc, Hydroxychloroquine/Zinc, and/or Ivermectin, and Vitamin D and C, whereas the vaccinated think they are immune because they had the experimental gene therapy shot.
THAT might be a valid point.
But the pro-jab can’t rely on that: because it literally undermines the entire “Emergency Use Authorization” rationale for the jabs in the first place.