Because they're protected by all of the kids with sane parents who get their kids vaccinated. That's how herd immunity works, unfortunately. The crazy ones are actually protected by the sane people.
The problems start when you get lots of crazies in one place, who aren't protected by sane people around them.
See Gaines county in TX.
Measles outbreak expands in West Texas around county with low vaccination rate
A measles outbreak is growing in a rural area of West Texas where vaccination rates are well below the recommended level.
In late January, two children in Gaines County were hospitalized for measles. On Wednesday, the state health department shared in a health alert that the number of confirmed cases had grown to six.
As of Friday afternoon, the outbreak has jumped to 14 confirmed cases and six probable cases among people who are symptomatic and had close contact with infected individuals, Zach Holbrooks, executive director of the South Plains Public Health District, told CNN.
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