I think I understand the direction you're going with this, and I appreciate your willingness to dig into difficult and often overlooked historical connections. For context, I don’t hold to evolution myself, I believe in the traditional Christian view of creation and fully affirm the authority of God’s Word. So, I’m definitely not here to defend Darwinism.
That said, I’d gently suggest that linking Darwinian thought directly to the Holocaust might not be the most effective way to challenge evolutionary theory. Darwinism was never meant to be a moral framework, just as the Bible, though full of truth and moral instruction, has unfortunately been misused by people to justify atrocities as well. That doesn’t discredit Scripture, just as misuse doesn’t necessarily discredit a scientific theory.
The common thread in all of these tragedies is flawed human interpretation. We’ve seen throughout history that ideologies, sacred or secular, can be twisted to justify evil. I know your heart is in the right place, you’re defending truth and pointing out real dangers, but this particular comparison could trigger an emotional response that overshadows your broader point.
There’s a lot of solid ground to stand on when discussing the case for creation, scientifically and biblically, and I think your voice in that space is valuable, but this particular argument just isn't very effective beyond, as previously stated, triggering an emotional response in your audience.