I think you need both avenues of persuasion, Cathryn. Most Christians, I'd hope, take their cues from Jesus, who never shied away from frankly pointing out what's right and what's wrong. Rightly understood, the moral imperatives of the Bible help steer people away from shipwrecked lives, rather than put caprious constraints on them. As it was in Jesus' day, some people will have ears to hear that kind of message; some won't.
On the other hand, let's also publish every scintilla of hard evidence that demonstrates abortion's devastating effects on women, children, and society. I get about two to five letters published every year in our two dailies, and I'm constantly sending my friends/family/colleagues the URLs of articles like those in #141.