https://reproductive-health-journal.biomedcentral.com/articl...

Most Muslim countries have horrifically high rates of consanguineous marriage, which directly results in reduced intelligence, increased birth defects, and other worse health outcomes. It also gives rise to dysfunctional, competitive clan structures that fragment and corrupt society: https://www.theamericanconservative.com/cousin-marriage-conu...

These countries will never be competitive and non-dysfunctional until they cut back on the practice.