Exactly. I think maybe a good first question when they start talking about the measles out break is this: How many people who were vaccinated got measles? 2cnd: How many of the measles cases are illegal immigrants?
Any significant number of vaccinated getting it would be really bad, it would indicate the virus had changed enough to fall outside of the immunity parameters activated by vaccination.
It’s kind of a two edged sword though, having everybody vaccinated creates a large “unexercised” immune systems pool that will get hammered if the veneer of civilization comes off.