Why not The West ban the risky business of muslims to marry first cousin,in the footstep of Mohamod not sceinc

Question

Muslims ,even educated one happily take the risk to marry first cousin negating all medical research.The Muslim follow the foot-step of Mohamod who married his first cousin (Zaineb)and his daughter Fatima to Ali.Why west should not ban this risky business to their Muslim Citizens .

Answer 1

We do, in the U.S.A.

Answer 2

I West Virginia I think 75% of the population is married to a cousin (or a sibling).

Answer 3

Muslims does not allow to marry first cousin if both fathers are brothers.
In the case of Muhammad,Zainab was his first cousin but not in a strict sense,her father was an outsider;even Zainab's mother was half sister to Mohammad's father.i.e they have different mothers.
and for Fatima-Ali was not her first cousin but an uncle. Ali was first cousin to Muhammad instead.

Answer 4

How far have you gone in your study of genetics?