When has so pure an example ever happened?
Do you think the Bishops would have made their only dogmatic moral definitions in a world-wide Ecumenical Council about things that never happened?
(Excuse me, I'm not saying this to insult you and I know you're pro-life, but that's like saying: "No woman chooses abortion." People do choose this kind of moral error, targeting innocent lives. Maybe not eagerly, gleefully, rejoicingly --- of course not. Maybe they choose it because they didn't understand the full implications. Maybe they choose it because they felt they "had no choice." But choose it they do, as a means to an end.)