I have a small scar on my left arm. My children do not. It is from a smallpox vaccination. I would much rather have that small scar than had to have faced that dreadful disease.
It's not a choice of A) vaccine and maybe a small scar from the shot but guaranteed health or B) no vaccine and definite illness. There is an option C) no vaccine and still have a high likelihood of not getting the illness, especially when you take good care of your general health.