Because there are a small volume of people who genuinely can't have the vaccine, and so require herd immunity to keep them safe. The refusal to vaccinate children capable of having the vaccine doesn't just endanger them, it endangers other people (both adults and children) who have genuine reasons why they didn't have a vaccination.
I am personally very wary of places where measles is common for precisely this reason.
But isn't true genetic immunity better than short term herd immunity? If someone dies because they're too weak to handle some infections, then surely that's a good thing for the future (as long as they didn't have children). In fact it's a well known and basic fact that medical intervention/artificial sustaining simply weakens all humanity. This is the fundament of medicine.
Heard immunity just seems a bit of an emotive stance which favours loved ones. No I personally don't care for herd immunity, I just want the the humans with the strongest genetics to thrive, like it's supposed to be.
I believe we should try to live in a sort of natural homoeostasis/equilibrium with all the other life on earth, instead of selfishly and emotionally sustaining our insignificant "herd" using artificial means.
Many of the vaccines are based on methods that have been tested thoroughly for decades and what side affects there are, are generally far rarer and milder than you'd get from the illnesses they help prevent.
That's not the case with polio for one. As well as easily identifiable and preventable things like non-airborne STDs.
70% of people infected with polio show absolutely no symptoms whatsoever. You know why? Because polio has existed for thousands of years, well before artificial life sustaining. So people who used to die from polio outbreaks thousands of years ago, died so we can have 70% today with genetic resistance that's so strong - it doesn't affect them at all. Not only that, less than 0.15% of people will die.
Now imagine if we had started vaccinating some people against polio 3000 years ago. Today we'd be absolutely ****ed against polio. That 70% figure of genetic resistance would be more like 0%. Now imagine 3000 years into the future, if we keep vaccinating absolutely everyone against absolutely everything, it doesn't look good at all.
In fact you know those pics where they have rows and rows of ventilators? That was only because they infected 120,000 children with live polio, and you know how many died? Only five! https://en.wikipedia.org/wiki/Cutter_Laboratories
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