For purposes of clarification...
I certainly do not assume that everyone who holds a view point other than my own does so from ill will. I do believe there is Truth, I reject moral relativism, and I do not consider the moral views I hold as "mine"; they are merely given to us by the Church, who stands on the shoulders of giants like Paul, Augustine, Aquinas and Newman.
The original post was prompted by wondering what I would do in Nazi Germany. Would I have helped the Jews, been indifferent or actually wished them ill? Perhaps others have more faith in their innate goodness than I have in mine. I could see myself in a role of indifference - a shrug of my shoulders and "what can I do?" or the venal "at least it's nobody I know". We are conditioned, now, to recognize the Holocaust as the horror of horrors, but there were far too few Germans who recognized it at the time.
What bothers me is the preversity of things like this: the controversialness of the partial birth abortion ban. It seems gratuitiously preverse to deny a baby - one that looks, feels, thinks and acts like one - a full birth when it is geographically indisposed (i.e. not completely out of the mother). This suggests an evil, or a level of culpability, that is more profound than those in favor of stem cell research. (It's the "they should know better" issue).
Certainly ignorance is, to some extent, protective. If you don't know something, you can't be held responsible for it. So the many pro-choicers out there who are pro-choice through invincible ignorance are not (thank God!) going to be held accountable. Ultimately where "invincible ignorance" ends and responsibility begins who can know but God?