Maybe, perhaps, in some possible world, it might be possible to consider abortion as an isolated ethical situation. But not in this actual world.
Throughout recorded history, women have been the most oppressed, the most savagely and brutally oppressed, the most exploited, the most abused and the most enslaved class, bar none. We can talk about the economic, social, political and psychological roots of this oppression 'til the sun goes dark, but the fact of this oppression is undeniable to any honest observer. This oppression applies to women as a whole: even ruling-class women until very recently experienced oppression and deprivation of basic human rights and liberties intolerable to even the lowest, most oppressed exploited economic class of today; and in part: take any arbitrarily defined sex-neutral group of people of any age or society, and the women in that group will far and away be the most oppressed.
We cannot consider any ethical discussion about the rights of women outside the context of this millennial, unequaled oppression of a brutality that exceeds the worst excesses of the most savage fascist regime. We must see anyone who opposes any restriction on any right of self-determination of any woman as in league with and on the side of the rapists, honor killers, acid throwers, and the billions of men who have stood throughout history on the necks of women without the slightest degree of pity or remorse.
Maybe in a thousand years, when the oppression of women has finally faded into the mists of history, we can consider abortion and women's reproductive rights in a neutral, independent sense (although I see no reason why we wouldn't come to the same conclusion as we would today). But today, the question cannot even be considered neutrally. There is no choice but to either unconditionally support every women's absolute right to reproductive freedom, or to ally oneself, however covertly, with the forces of brutality and oppression.