I would suggest that the parents who are against vaccination should start looking into what we have done to the food chain over the past 30+ years.
Hormones injected into cattle to produce more milk!
Injecting feeder/finisher beef cattle with hormones to obtain better growth and feed efficiency!
Cement dust in their feed to bulk up cattle!
Feeding animal parts to cattle - mad cow disease!
Injecting antibiotics into their animals for something or other!
and the list goes on and on ............
IMHO we are killing our own. Animals are supposed to be grass fed, not fed garbage to make money for the farming company.
If you have the time you might find some interesting information in this article
Milk: It Does a Body Good? | Weston A Price. And by now, you will have realized I am a health nut!