To flip states/counties blue?

Morbid but accurate (and maybe "you should even think that!" ) but depending on the ratio there of blue to red and how closely correlated pro and anti-vax are to their political affiliations, it would only take as many reds down to give the voting blues the majority.

(Maybe what you were thinking of in the first place.)

It is kind of Darwinian in that regard. Brought me right back to my HS. Algebra.
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Except, there is the psychological factor - namely, the more unvaccinated die of the virus, the more the remainder change their minds.