They likely also have some marginal impact on transmissibility.
But the data shows pretty clearly that the effect on reduction in transmissibility is quite low, or else there would be an obvious relationship in the data in infection rate vs vaccine uptake... Which clearly there isn't. If you believe otherwise, please share data proving some macro effect of reduced case counts correlated with vaccine uptake.
There's nothing political about what I'm saying. I am arguing against policies that are not backed by the data or science.
People proposing policies that are not evidence based are the political ones.