To my mind, abortion rights advocates do not love abortion in the way that pro-lifers love the life of the unborn. I therefore think it inaccurate, and actually quite inhospitable, to refer to those who support abortion rights as being pro-abortion. They view abortion as many pro-life folks view war, as something horrible but sometimes justified. Just as it would be disingenuous to call those who soberly support a particular war as being pro-war, so I think it disingenuous to label those who defend the legalization of abortion as being pro-abortion.
Why does this matter? If the pro-life movement has any hope in establishing a culture of life in our society, it will have to do much more than overturn court decisions or outlaw offenses against life: it will have to hospitably engage and persuade those among the pro-choice movement who are formidable formers of our culture. Applying terms to them that they would not apply to themselves is a way of ostracism and alienation, and not a good way to open hearts and minds.
St. Thomas Aquinas, who could articulate an opposing position more precisely and persuasively than could the opposition, is someone we can look to as an exemplar.