"For one thing, "harvesting human beings" is a ridiculously loaded and skewed phrase."

I'm not sure that it is (ridiculously loaded and skewed). But even if it was, the reality of what he's saying is so. There is nothing about science that informs our sense of ethics about harvesting humans.

What's more, we are so pre-conditioned by self-interest that even when the data provided by science does inform us that we are acting contrarily to accepted ethics, we will still choose comfort and self-interest over ethical behavior.

For example, science informs us of the "viability" issue regarding the unborn, yet the law is yet to be changed to reflect the advances of science that tell us that we are, indeed, killing babies, not "fetuses".