You may not fully appreciate the effect successful efforts to save unborn children have on future generations. I can assure you, sir, that I have given considerable thought to all sides of the issue. Hopefully, that is demonstrated by the numerous responses posted in this section. In short, such arguments are fine examples of using invalid mathematical extrapolations to arrive at unsupportable conclusions. However, I would never know the difference and it's highly likely that my parents would have conceived and borne another child in my stead.
Most parents only intend on raising a particular number of children.
They will raise that number of children whether or not one or more might be aborted along the way. Therefore, abortion will have no effect on the number of their descendants. Men who would masturbate rather than have sex would also be guilty of denying a potential birth.