Doulos:
If someone truly believes that abortion = murder of babies, then wouldn't the murder of an abortion doctor, or the fire bombing of an abortion center, be a morally positive thing to do?
I'm not suggesting people do it, but what's wrong with that logic?
Not a lot, if you're a person who cares less about principles and more about results. Terrorists are often of that sort of mentality. In many places in the U.S., predominantly in the South, they do actually have this mindset about the issue. Some think murder and arson is simply too far, but everything short of that is basically fair game.
As for why they all don't embrace murder, self-preservation is a big one here. It's the reason most sociopaths, that is, those who are diagnosed with Antisocial Personality Disorder, aren't murderers. It's not that they care so much about the value of the lives they would affect so much as the consequences it would bring to them. In this society, unless you have some fairly strong mitigating circumstances, killing someone would cost you a great portion of your life, if not your entire life. People might think someone should go and shut up that bad man in their neighborhood with a little vigilante justice, but they are too afraid of the consequences to do it themselves, either getting hurt by said thug or by the law. They'd sure applaud the person who did have the courage to do it, though. In these circles, we probably would see more celebratory killings for the cause, if they actually believed they could do it and get away scott free. But people in general, not just in this movement, tend to be cowards when it comes to actually standing for their beliefs at a significant personal cost. It's what makes those rare individuals who actually do put themselves at risk for their beliefs seem so special to the rest of us.
In some circles of the anti-abortion movement, that's pretty much how such figures are received. Many of them commit smaller acts of terrorism to abortion providers. Crowd facilities, curse them on sight, lie to their clients to scare them, physically intimidate them, stalk their movements, try to out them to their neighborhoods by demonstrating in front of their houses and harassing their families, vandalize their car or break into their offices or homes to sabotage their ability to go to work, etc. In certain parts of the country, many abortion providers go through great lengths to keep their identities and whereabouts secret specifically because of these tactics. However, most of these, as horrific as they are, are minor crimes that won't really cost these individual aggressors much. They are too many to hurt physically, and often the law in those regions are sympathetic to their cause, so they won't be made an example of.
However, very few are willing to take the sacrifice necessary to kill an abortion provider. These men and women naturally disgust some, but others see them as courageous and noble on a level above them, and revere them as martyrs, essentially tributing their lives for the cause. Try to find anyone over the past fifty years or so who tried to kill an abortion provider, and you will find a certain fanatical element that sees these people as heroes. It's no surprise that most of the people who went to take that final step are people who often didn't see much value in their own lives in the first place that they were more than happy to throw it away to a cause they saw as greater than them. Which, as you'll notice, fits the profile of a suicide bomber quite well. Even if relatively few people do it, the effect is quite great, as it legitimately scares people out of the abortion practice. No joke, some of those regions of the country have a very, very hard time trying to replace their doctors, because of the fear, harassment and risk that comes with it. It's terrorism, pure and simple. Different causes, different worlds, same principles.
I should note that most pro-life advocates don't follow this line of thinking. They honestly don't. As tempting as some might be to brand the whole cause by it's worst elements, it's generally nothing short of a straw-man to do so. This kind of mentality fails when you believe principles are just as important as results, if not more so. Most Christians, I would think, feel that there are rules that are too important, too sacred, to violate willingly, even if it would be convenient. After all, if they were willing to kill for the convenience of their cause, how much different would they be than the abortion providers they so revile, or the women who seek to kill their babies for their own convenience? The idea of redemption and understanding are pretty important to Christianity (or at least certain interpretations of it), but by killing sinners, you basically make that impossible. Compassion appeals to some, if not most, more than Justice.