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Just like the unvaccinated scream/think "my immune system" is better. Well, history has shown the human immune system, while amazing, usually left people dead by 40 until vaccines and other modern medical advances came about.
Not to derail, but these things improved life expectancy far more than vaccines:
- availability of clean water
- improvements in living conditions
- improvements in personal hygiene
Vaccines are available in the developing world but those 3 are not, and life expectancies remain relatively low.
Not disputing that they helped, but they're not the single or even most important reason for life expectancy increases.