Bop the misfits on the head. How do you suppose they detected diabetes and other non-visible genetic flaws, hmmm?

Then you wonder why people think you might be a troll.

Anyone with a sixth grade education in biology, much less anyone who breeds dogs for a living, knows that broadening a genetic pool as much as possible results in more genetic health. Heck, that's how DNA and evolution WORK. This is also why amoebas are still amoebas.

Species unable to keep their genetic code broad have suffered. It is interesting that cheetahs apparently suffered some massive extinction thousands of years ago, and all current members of the species are very closely related genetically. This has been a problem for breeders, and will probably be a problem for the species.

For the record, cultures work the same way as physical genetics. The good stuff tends to be preserved in cultural mixing, improving the culture, while the bad stuff--with luck--fades away. True cultural diversity*, a mixing of ideas without forcing them on people, is one of the reasons America is as strong as it is.

* Not to be confused with the leftist definition, which basically means many different colors, religions, clothing styles, etc., but all tied firmly to a narrow band of socialist ideas. Or, as it has been put, "many packages, same contents." It's worth noting that no one demands that a percentage of college staff be conservative in the name of diversity.