Silvianoshei said:
Fine. Let's talk "damaging."
Technically Anal Sex is incredibly high risk, as it's receptive form is the most efficient way of STI transmission. Much more "damaging". Do we ban that? No.
1) The damage can be reduced to 0 in a stable, monogamous homosexual couple who have no STIs.
2) The damage can be greatly reduced by condom usage.
3) We're talking about damage between consenting adults vs. damage you are going to potentially do to a new human life; very large difference. You're bringing a 3rd party into the equation.
Also, take a genetics course, PLEASE, because you're wrong. Firstly, DNA is not "damaged" when you inbreed, you simply have less diversity in terms of your genetic pool. It does NOT automatically increase your chances of genetic defect, it just means that if both your parents had a chance, because they're from the same family, then your chance is slightly higher. It would be the same if two completely unrelated people with those same potential defects had a child.
As an aside; I actually support genetic testing for anyone who plans on having a child.
Also, in my eight(+) years of college I've taken a couple genetics courses.

You might be interested in these links:
http://www.npr.org/templates/story/story.php?storyId=6509683
and
http://www.biolreprod.org/content/early/2010/05/24/biolreprod.110.084798.full.pdf
The first relates to humans, the second to possible damage done to sperm DNA done in other species... and yes you can't use animals in human studies, but if YOU have taken genetics courses you know much crossover is done this way because all living beings, well, have DNA. We can make certain guesses based on this.
Also, please don't compare dogs to humans; there is a reason why animal studies are never accepted as evidence for biological plausibility in Hill's causal criteria.
Correct; and you also know that animals are seen as a rapid way to get results with genetic testing BECAUSE you can breed so many generations so quickly.
Almost two centuries of inbreeding.
So as long as it takes a while, the damage is acceptable? Personally, when I sought out genetic children I looked for breeding partners as far away from me genetically as possible; and I am happy I did. I know these discussions make people uncomfortable but really, remove all the "ew eugenics" feelings from it and just look at current medical technology and the wisdom of having a child without at least considering his or her genetic future.
My two cents on that.
Do you understand? This is not a public health issue. It's a cultural one.
Peace, brother or sister. We can disagree without questioning each other's comprehension abilities. Yes, I do understand what you are saying I simply think we disagree.