Whenever I mention the likes of Newton and their works, I frequently get attacked by some people. Their argument is that Newton was a terrible human being and despite his contributions to Science, Mathematics, and the process of discoveries in general, he does not deserve praise since appraisal implies we would be condoning his behavior.
To that I usually reply, we would never accept some of his behaviors now and that does not mean his contributions are worthless. They believe we can never separate the "works" from a "person", to which I always disagree.
EDIT: Grammar.