I mean, if we're talking about what might've been then there are easily a hundred million lives lost each year to menstrual cycles in the US alone. Just gone. Think of how many Einsteins, Mozarts, and Davincis have already been lost to us! Abortion is <1% of this much bigger problem, practically a rounding error.

^This may sound ridiculous (I certainly think it does) but I think contrasting it with your post is a good thought experiment. Can you see any meaningful difference between your comment and mine? I can't, but I'd be very interested to hear your reasoning if you feel they are different somehow.