If we are talking in the context of submitting it as a paper to a journal, then a problem is plagiarism. If we are talking about "does hitler have some non-genocidal ideas?" then like I said, not sure I care. "How was hitler so persuasive?" Interesting. "How did hitler outmanuever his opposition domestic and foreign" . Interesting.

But yes you have a fair point that just because Hilter said X doesn't automatically invalidate X. The old "the nazis drank milk so dont drink milk" fallacy