Here's the thing. Rachel's Vineyard's chief psychologist  draws a direct link between the morality of the act and the negative feelings experienced by the women. She has said: "Abortion is the intentional taking of an innocent human life. Therefore it is morally wrong. As a result, those who participate will experience a range of emotional reactions including guilt and grief as with any death, and some will experience mental health problems needing treatment."

However, many women who surrender their children for adoption also suffer grief and guilt, yet adoption is not viewed as morally problematic. (This has been an emerging area of research in the last ten to fifteen years.) And there are other women who have few problems post-abortion or post-surrender. 

According to Rachel's Vineyard's own reports, women have from time to time abandoned their retreats.

Can't get a good handle on any of it. Seems like it helps some and turns others off.