FTR, I am in the "vaccinate early & often" crowd. But, then, I have read a few books on disease & history, public sanitation & health, etc.
I'll play the odds, thanks. We are letting in every third-world fool, the more ignorant & savage the better. No doubt we are seeing outbreaks when those sort mix with Whole Foods Mom's and Prepper Mom's unvaccinated kids. The third world replacement population is going to bring in enough diseases for which we don't have vaccines. No need to make it easy for them.
What gets me is that kids & adults who truly can not tolerate vaccination are the only ones we can afford to let go unvaccinated. When we add on WFM's and PM's kiddos, we have sufficient infect-able population that we will have outbreaks...and possibly harm those who truly can not tolerate vaccination.
OTOH, gov't makes it difficult to defend the pro-vaccine position by producing flawed studies, being the sole contractor, and protecting the manufacturers & selves from legal risk.