Science isn't a concrete, definitive arbiter of morals - we still need to apply human reasoning and rationality to develop the full picture, but science has the responsibility of informing us on a fundamental level what is good and what is bad.
Science tells us women are no less human than men, not that they have the exact same physiological makeup as men. Science tells us perfectly well how incest, murder, rape, and infanticide are bad - they're detrimental to society. Incest produces genetic defects, murder and infanticide kill people, and rape is harmful to the victim in various physical and psychological ways.
Cannibalism on the other hand is more debatable. There are some diseases that can be contracted from cannibalism, but probably not more than any other type of meat that humans consume. I am against cannibalism, but I'm not sure if I could call this a moral statement. If it requires killing someone, then that's obviously immoral, but if it's simply a deceased person's flesh that someone is consuming, then I can't really say there's anything morally reprehensible about that.
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