re: The goddamn bible
(leaving aside the confusion of asking a deity to destroy his own book...)
Of course Amazon's policy appears confused, but it isn't really. Amazon operates on a materialistic basis. Their policy is to make money. Mouthy people hurt profits (pro or anti-incest), not selling stuff hurts profits, so they will try to avoid both, which leads to policy implementation alterations depending on who is shouting loudly at the time.
Is this a good thing or a bad thing? Based on the assumption that there is no God, then Amazon's actions are just part of the randomness of the universe. There is no right or wrong except what we make for ourselves and Amazon has simply done that. You can also chalk up any complaints about Amazon to more randomness, which the high-priests of Science will one day be able to trace the way back to the big bang.
Yay for Materialism!
(and I'm still not sure of most people here are in favour of having sex with close relatives...)