Im just wondering why some people dont?

I dont want arguments, healthy discussion would be good though As I hate doing anyhting with my childrens health that isn't natural eg:breastfeeding, pain killers etc. But with vaccines I just thought it was the next step for bubs once they're born.
We are told about bf vs formula and cloth vs sposies. But why not to vaccinate vs not to?

At the moment my thoughts are Id rather my child get vaccinated then get a disease and die BUT I also dont know anything about the alternative.

So can anyone help me?