If your body is part of a society that is using vaccines to reduce or even eradicate a harmful disease then you need to realize that your "natural right" is violating the rights and safety of that society. Even if you become a hermit, unless you can guarantee that you will never physically interact with other humans, you are a risk.
If someone is against being vaccinated are they thinking "You will not expose me to weakened or dead microorganisms, and in return I will become a potential host for potent versions of those same microorganisms that I can then expose others to against their will". It seems hypocritical to be against the first but okay with the second. Or are they thinking nobody will get infected? We see outbreaks happening now, and you know it's not the vaccinated ones causing it.
I feel sorry for the children, they don't know any better. It reminds me of the children of "Christian Scientists" who die needlessly because their parents used prayer instead of modern medicine.