Oh, Polio! Did you know the Polio vaccines were actually weaponized with cancer-causing monkey viruses that were being experimented on in order to develop biological weapon to kill Fidel Castro? That's why there was such a peculiar spike in cancer rates among people now in their 50s+ when it used to be almost non-existent. The disease wasn't meant for the American people, but they DID know about it and administered the vaccines anyway, while subsequently firing the scientist who sounded the alarm on contamination.
It's actually a really scandalous and interesting story. "Dr. Mary's Monkey" by Edward Haslam provides an incredibly well-researched account (numerous references to original source documents at the end of every chapter, and the narrative is essentially laid out like the presentation of a court case). If you truly wish to have an informed opinion (instead of just AN opinion) I would definitely recommend starting your research there.
Also: in theory, if there is actually a benefit to the vaccines you have given your children, vulnerability to UN-vaccinated children is a mathematically unsound argument. Because what then was the point of the vaccine? I would probably stop using it, if I were you. The people who told you to defy your own reasoning ability in this manner are turning a multi-trillion dollar profit on the chemicals in question. Just saying. It doesn't hold water.