"Catholic teaching is very clear that life begins at conception, and that the taking of a life is an objective evil. But when faced with an impossible situation, sometimes the "objective evil" is the correct moral choice."

Well stop calling it an objective evil then. You call it an objective evil, the stance of an absolutist if ever I saw one, then guess what: you qualify it. No wonder Catholicism is so confused. Is abortion OK or not? Is contraception OK or not? What about sex before marriage, gay marriage, homosexuality, oral sex, anal sex, masturbation? The average Catholic can google any of those and find that the Church has an unbending authoritarian stance about all those things. You blokes who have spent eight years in seminaries may well have nuanced these matters, but the average Catholic is kept dangling. And that is exactly what your Church wants, that is exactly how your Church exerts power, by acquiescing in doubt and confusion. Finally, let's just analyse your stance on "life begins at conception." Now what you're doing here is taking your obstinate anti-abortion stance and extrapolating back in order to arrive at a definition of life that precisely fits your standpoint. Not honest, not real, not Christian. And kindly leave your morals out of it. We can all do morals, you know.