They were saying that abortion should be legal because children of poor parents would grow up in misery.
Ask them this: If they took a poll of 1,000 poor kids, how many of them do you think would say, "Yeah, I'd sure rather have been ripped limb from limb and vacuumed up instead of growing up poor."
Also, raped women would be too traumatized to carry their children.
It is a well-known fact that one of the main psychological problems that rape/incest victims go through is having feelings of unjustified guilt. Ask your friends if they really believe that the best way to cope with this psychological trauma is for the woman to kill her child. And it is her child, even if he or she was foisted on her by vile circumstances. You may also want to point out that a tiny percentage of rape victims (1% or so, if memory serves) actually become pregnant. Many rapists fail to ejaculate; rape is, after all, a hate crime in which the weapon of choice is a penis, it is not an act of procreation. You might also ask what other psychological problems or unpleasant emotions justify killing children. Andrea Yates sure was having a rough day...
Also, teenage girls would have their lives ruined by caring for illegitmate children.
See argument for "poor kids being miserable" above. If their best answer to teen promisuity is turning babies into medical waste, they are sick puppies indeed.
They then said that pro-lifers were just cruel and evil.
This is just beyond the pale, and you are perfectly justified asking them for an apology. More to the point, ClearCase_guy put forth the very point you should bring back to them: "Pro-lifers are cruel and evil because they want innocent little children to live. Got it."
Be carefull how you present these arguments. Pray first, and be sensitive to where these folks might be coming from. Women in the group may have this position because they have aborted a child. Most women choose abortion because they are convinced there is no way other out. Granted, that's not an excuse-- my daughter carries the middle name of a woman who sacrificed her life for her "products of conception"--she refused chemo because she would have to abort to take the treatments. Men also tend to defend the pro-coercion side of the question if they helped along an abortion decision in a wife or girlfriend or even just stood aside while she made the call.
Let me also suggest a book called "Who Broke The Baby?" It takes the pro-abort arguments in turn and demolishes them--and I do mean demolish!
For one thing, don't call them "pro-aborts" like Mr. Silverbeck did. :-)
I don't have any other suggestions other than try not to put the other person on the defensive. That usually makes them more prone to defending their own positions rather than listening to yours.