Oh I dunno - let’s start with this!
http://singularityhub.com/2011/09/15/sperm-donor-has-fathered-150-children/
the donor’s sister contacted Tyler and his mother – not to help Tyler meet his father, but to tell him there was a good chance that he had a genetic heart defect. Tyler’s biological father had almost died at the age of 43 when his aorta ruptured. Two of the man’s brothers have the disorder, as well as his mother. And by the way, the family has a history of a connective tissue disorder called Marfan’s syndrome. Tyler’s biological father had never told the three clinics at which he donated sperm of his genetic conditions. His sperm has been used to father at least 24 children, yet he was never required to update his medical history with the clinics.
So exactly how does this doom the human race?