The assumption of bad faith is the first refuge of the lazy leftist: "Why, my position is so obviously the only rational one that yours can only be an act! You cannot possibly believe what you say about climate change/health care/Islamic terrorism! Clearly it can only be explained by the check from your puppetmaster!"
But it's not just the lazy leftist; as we've seen before, lazy anti-Catholics can resort to the same nonsense. "If they were honest, they'd come to the same conclusions as I do!" Uhh...sure.
But it's not just lazy leftists or lazy anti-Catholics, either. It's just plain intellectual laziness. It's much easier to dismiss those who disagree with such ad hominem nonsense than to actually consider why it might be that they have different views than I do. And I mean that first person pronoun. I have done this too. Let's be honest, folks: we don't know why the other man believes what he does. We don't know his heart. Heck, we don't even know our own hearts very well, and we have 24/7 access to them! How foolish then it is for me to pretend that I know another man's heart (and consequently why he believes what he does).
Let's cut the other guy some slack and presume that he's actually acting in good faith, even if we don't understand it. That doesn't mean he's right; it just means treating him with charity. It means applying the golden rule. The Pontificator was completely right with these rules.