German incest couple lose European Court case

If keeping it in the family was good enough for the crowned heads of europe then why can't those two get friendly?

Farmers know this, too. That's why they sometimes try to "inject fresh blood" into their herd. Stirr the gen-pool, that is, revitalise the diversity.

Doesn't that actually counter your "logic" completely as it is an example of an occasional partial break from the practice of inbreeding?
Come to think of it doesn't several examples by you in this topic completely contradict what you have claimed in other topics on breeding and society.
Doublethink at work