This, I think, is a conclusion which common sense on the whole accepts: though I note a considerable reluctance to accept it; which, however, is not shown in the attribution of virtue to persons who do clearly wrong acts, but rather in an effort to explain their ignorance as caused by some previous wilful wrongdoing. We try to persuade ourselves that if (e.g.) Torquemada did not know that it was wrong to torture heretics, lie might have known if he had not wilfully neglected means of enlightenment: but there are many cases in which this kind of explanation is unsupported by facts, and I see no ground for accepting it as generally true.

ME Book 3 Chapter 2 Section 2