What I'm saying is that I don't see where you've achieved your goal.
1. Hitler used a perverted notion of
animal breeding, applying it to races. That's
unnatural selection.
2. It has been shown that Hitler definitely
claimed to be a Christian, when it suited him, and it suited him when he was trying to win over Christians.
3. In your own quote, Marx spoke of
rising above the "dog-eat-dog" animal world. How is that a perversion of Darwinism?
4. You have not shown (to my understanding, anyway) that any of the above were misuses of
science.
I'm not saying I disagree with you. I'm just saying I don't see where you're making your case. I don't see any real link to science in anything you've said, and I don't see where you've shown (other than by assertion) that an appeal to science would have had any impact.
People who think they have all the answers usually don't understand the questions.