Honest and sincerely held opinions differ on that question. That's the problem.
That's not the problem. That's the dividing line, for me, between pro-life and pro-choice. (Those are terrible labels, BTW. Who is actually anti-life?)
The point is, it's OK, even preferable, to have people on both sides of that line. But it's also important to remember that both positions are valid. Just because we disagree doesn't mean we shouldn't bother talking. Which I think is what rubbed me the wrong way about what Nabu said here:
There is no way for me to see anything on the other side in a positive light
It bugs me that we are so polarized that we can't look objectively at the issue and say from the pro-life side, "I believe abortion is horrible, but maybe making it illegal isn't the best way to eliminate it (viz. the war on drugs). Or, on the pro-choice side, "You know what, you have a point. I think women should have the right to choose, but maybe we should consider how we as a nation might give women some better options -- more choices before conception -- that might prevent some of these unnecessary abortions."
I don't expect everyone (or anyone) to agree with me on everything (or anything). But I think it's important to talk about where we can find some common ground (better access to healthcare and birth control benefits everyone) even if the philosophies that got us there are different. I know that many people do not believe that life begins at conception, or that the well-being of the mother outweighs the life of the child. I don't understand it, but I acknowledge it and don't expect to change it.
I won't waste my breath trying to convert people to my way of thinking. I am about building a coalition to benefit the greatest number of people in the shortest amount of time. The path of least resistance -- the largest positive course of action on which the majority can agree.
In the end, I don't care what you believe or why you believe it, as long as you vote for my guy on election day.