When it comes to vaccines, yes there are occasional adverse affects. But, these are minimal compared to incidences of adverse affects due to potential pandemics. So, vaccines like all medicine are based on a benefit vs risk factors; nothing is absolute.
Before the widespread use of vaccines, it was estimated that an infectious pandemic would run through populations every 40 - 60 years. One could possibly suggested this culls the many tribes for a stronger gene pool and keeps populations in check. It also means that we have to recognize the cruelty of biology, sacrifice of the few for the entire species. Certainly not based on any conspiracy.
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