The wrong thing with incest is that nothing good can come out of it. Birth defecs aside, if you're willing to suffer issues with any serious relationships you may have just so you can pork your mom, go ahead. It doesn't make it any less right to bang someone from your own kin.
I disagree that nothing good could come out of it. You could have a long, happy relationship with someone from your family. It's unlikely, but it's entirely possible. Also, "no good can come" of having a relationship with someone with a terminal illness. They're going to die, you're probably going to be fucked up by it. Are you saying that that should be considered immoral too? Sometimes the right thing is to let people do what they want to, even if you believe it's the wrong thing.
Sim if you apply your incests arguments to murder it seems like you'd be totally cool with someone butchering your family because it's their perogative
The only thing that is more pointless than an incestous relationship is an argument with speed. If you want to believe it's fine, go ahead. Not going to bother with this any further.
Ok I will. The human race, in fact every other living thing needs genetic diversity to survive, which causes problems with critically endangered species. While humans aren't critically endangered, making incest socially acceptable just causes too many problems, including the many genetically inherited diseases, when one parents has a the flawed gene the chance of their children getting it are usually 25-50%, if both parents have the faulty gene it's 100%. There is so many negatives to incest and there are so many other "fish in the sea" the is no reason what so ever for it, it's incredibly dangerous and should be avoided at all cost.