And those who don't vaccinate are freeloaders! They selfishly benefit from the effort of others while giving nothing in return. Moreover, they unnecessarily increase the risk of illness for those whose health is too weak to permit being vaccinated. Lastly, they put their own children at unnecessary risk. While it's arguable that parents have the right not to vaccinate their children, because this involves the health of the greater public, we think it's an area that should be addressed more directly by public policy.