For the anti-vaxxers I’ve always found the counter argument a slam dunk and impossible to repudiate.
It revolves around benchmarks and timelines. Pick any disease from polio to tuberculosis to smallpox, measles, whatever. Pick the year the vaccine for each was introduced and then stand back and plot the before and after incidents of each.
That’s it!! How else do the anti-vaxxers think these diseases were eradicated and why they still exist in many unvaccinated third world countries? Contrast and compare.
It’s impossible to argue with the timeline logic but even more impossible to comprehend, how in a supposed educated and enlightened, first world society, where logic and reason are our lodestars that there are still people stupid enough to buy the pitch of the anti vax snake oil grifters.