Evolution cannot account for morality

[Jehanne]

In my opinion, moral truths exist to the same extent that mathematical truths exist.  I don't think that a god is required to explain why 2 + 2 = 4, nor do I believe that a god is necessary to explain why the deliberate killing of innocent human beings is also wrong.

Well that's your own personal mistake. Those two things aren't the same at all.

Prove it, or, provide a counter example. For instance, incest is a taboo in all cultures, from prehistoric times up through the modern era.