I don't understand why some people (likely leaning to the right) are so bothered by a vax requirement. When i went to college, i had to get the MMR, and for good reason - so Measles, Mumps & Rubella wouldn't spread thru the university like wildfire. Duh! Nobody was protesting then! Why don't those morons, errr, people, why don't those people who support t**** remove their heads from their asses, allow airflow to continue to their brains, and wake the fuck up???!!!#&=\/?? Soapbox exited.
Easy answer for your question. It's something about rights and chemicals and Big Pharma and government telling you what to do and a few other things that are either completely ignorant or completely selfish. See. Easy answer.
At 75 years of age I have been wondering the same thing. Anti-vaxxers forget that this is not a "choice." It is often a requirement. I have been vaccinated my entire life and have seen many bad diseases removed from society because of it. This includes polio. You just cannot cure stupid!
Polio is nearly extinct in the world today, except for two countries where it still lingers. Namely Pakistan and Afghanistan, where of course, some of the religious authorities are opposed to vaccine.