That is heart warming to hear, but ‘the continuity of the family’-wealth, land, power, prestige, etc. out weighs the welfare of their offspring.
At the very least they could submit to genetic testing and choose one cousin over the of another based upon those results.
Well, no one can make them do what they don't want to do.
It's their culture and country.
Here many people marry for wrong reasons: money, power, fame, status. Children, sometimes, aren't even wanted. Western women ABORT their children. What could be worse?