You shouldn't accuse anyone of lies if you fail to understand how genetics work. Recessive alleles are not "in danger", their number would not decrease over time if there is no bias. That's basics.

https://en.wikipedia.org/wiki/Hardy–Weinberg_principle

Also anti-miscegenation laws is not a universal thing, but rather a specific facet of an Enlightenment-era Western culture, along with slavery.