I was summarizing what I thought to be the author's conclusion rather than a premise. I used vague terms for brevity, being that my purpose was to distinguish the authors conclusion from a conclusion that it gave rise to all evil which seemed how Ender was interpreting it.
For myself, I think judging Darwin's theory to have moral culpability for Nazism is quite a stretch. But I don't think it as big a stretch as Ender's subsequent contention that it was the gospel of John that was the "proximate and ultimate" cause of the Holocaust. Subsequently, I have been debating Ender for quite some time now.
I never went that way but the biggest holocaust was the great flood.