I see, so we’re running into a pitfall of arguments based on consequences here – we don’t know what the consequences would be. Perhaps you kill an abortionist, which, when publicized, makes a bunch of pro-choicers become abortion doctors, and leads to more death.
But suppose one infiltrated an abortion clinic, and then - moments before he aborted a child - killed the abortionist. This is politically unwise, I think, and I’d be really pissed off at anyone that did it, but it would not be intrinsically wrong. The difficulty is that it’s not clear why that level of force would be necessary.
The important point, I think, is that we pro-lifers encounter this question without falling back on meaningless claims like “Two wrongs don’t make a right”. There are times when killing isn’t wrong, and righteous anger calls out for justice.
We need to be prudent. But we also need to seriously address the issue by our actual standards. If high school students were being systematically exterminated, you better bet people would be calling to use deadly force against their exterminators – and rightly so. I do NOT think it’s right to kill abortionists, but we should not lie to ourselves and say that we are withholding justice from abortionists because they are “not that guilty”. Their sins cry out to heaven for vengeance, as do the sins of women who have sought out abortions. As do my sins.
Justice will be served. But sometimes it’s not ours to serve out, that’s for sure.