It's important to remember that vaccines are not perfect. I know from personal experience that there are people for whom the Rubella vaccine in the MMR shot simply doesn't work.
In order to get my work visa here in Taiwan, I need to get a health check every year, this includes a blood test to look for, among other things, MMR antibodies. I don't have Rubella antibodies, despite getting three MMR shots in three years. I talked to my sister (a pediatric nurse who does vaccinations) about it and she admitted that this is not at all uncommon.
Vaccines are at their most effective when the rate of vaccination is extremely high, near 100%, providing a high level of herd immunity. People who chose not to vaccinate their kids are jerks.
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