Blitzwing said:
Shiny Koi said:
Incest is not morally reprehensible. Anyone saying so must have the moral and logical comprehension of a child.
Why? Because being against incest boils down to "ew, I wouldn't do my sibling/cousin/parent! so it's wrong!". You guys know that 99% of homophobes oppose gay marriage for that very reason, and that you are likely to oppose them for it?
Anyway, you literally cannot support homosexuality without supporting incest, because all of the arguments that apply to homosexuality support also apply to incest.
Except for the genetic defects it can produce and the fact that we develop a metal block that prevents us from being attracted to our immediate family.
The extent of genetic birth defects/detriment to the children is being a bit overblown on both sides of this argument. It is neither completely risk less or an absolute detriment to the child. The reason we have a predisposition to incest is because diversity in offspring is a selected for not because of child birth defects. There is a difference.
Detrimental alleles are more likely to be passed onto the offspring of those with incest. Using basic genetics puts this at 25% chance of becoming homozygous for any particular allele. That means you have 25% chance of passing on the same alleles to your child, and if those alleles are detrimental in some fashion your child will exhibit that trait. Individual detrimental alleles are statistically unlikely to impact the quality of life of the child, and in one generation this is unlikely to accumulate to any serious problems. That is unless the parents are a carrier for a recessive disorder, such as the one that can cause cystic fibrosis or any other problematic recessive disorder.
However, serious cases like this are on the same order of likelihood as individuals passing down a problematic detrimental dominant allele. No one would advocate that anyone with a dominant detrimental allele should be forbade from having children, with lethal/torturous disorders like Huntington's Disease being the exception. The effect can be almost completely eliminated if you opt for expensive embryo gene screening. Thus the argument that it can have a negative effect on the offspring as having sex with a smoker. Less risk than a 40 year old woman having a child I believe.
That is of course under normal circumstances. For example if you know your family carries the gene for cystic fibrosis you defiantly are putting your potential child at risk.
Moral of the story, if you have the money get your genes screened people. And I mean all people, for the children. Also arguments about biological diversity being good for the species are moot. Not because it isn't true, but because as a society we have already set the precedent that what is good for the species isn't a prerogative.