I said " If you've just found out that Newton was a slave trader, you're the one who has been naive."   A conditional statement--and since you haven't just found out, the condition isn't met, and we're both off the hook;-)

Looking at my comment, it seems more harsh than I meant to be--my point wasn't meant to be personal judgement--

it was just a reflection on the fact that :
A)a man who had done many odious things did a great thing,
B) that we remember many men who did great and odious things,and
C)to make things easy, we lean toward ignoring one or the other--which, we really shouldn't do--