Not to mention that these people who don't vaccinate their children only get away with it because enough others do to keep herd immunity high.
"Not to mention that these people who don't vaccinate their children only get away with it because enough others do to keep herd immunity high."
Since there are occasionally adverse reactions, the optimimum vaccination rate is less than 100%. In a free society, the actual vaccination rate would approach the point of zero marginal utility from further vaccination.