Originally Posted by listopencil
Yeah, you would think that a very primitive society would have substantially different "moral" standards than us. I hesitate to refer to it as a moral standard for those issues that you stated. This is where tribalism began, and survival of the tribe was the key imperative.
Well, I mean the founder effect can be seen in a lot of closed communities. It's the reason Amish people are usually born with an extra finger. I think morals went as far as empathy and protecting the tribe. In smaller communities in America it's not as uncommon as you think for people to marry within their family tree. It usually takes a few generations before problems arise.
Also, I post this any time inbreeding comes up.