It wasn't mean to be a "lol red state" thing, for instance, California law still allows first cousins to marry. What in tarnation.
Bizarrely, the map for cousin marriage is roughly the inverse of the age map, with it being permitted on most of the East coast, CA, CO, NM, AK, & HI.
I say this having discussed the phenomenon with friends who immigrated from Pakistan and all of whom have met first-cousin married couples that had one or more children with birth defects or mental disabilities that could very well have been the result of it.
For example, dog meat is still legal in South Korea (until 2027), but trying that here would not be acceptable nor would any reasonable person think it's discrimination.