If you do not in fact believe abortion to be a moral negative then I have been tilting at windmills, and have no argument with you.
See my post to screwtape just now. Between the two of you, I got a better understanding of how I'm thinking on this.
I do consider abortion to be a moral concern, but it's neither a moral positive or a moral negative. It's...how to put this...it's a decision that can only be made by a moral agent, and that should only be made by the moral agents directly involved in it. Does that make sense?