The perp could try out an interesting defense...he could blame Bill O'Reilly for cranking him up. From what I understand O'Reilly has talked about Tiller for years and claimed that anyone that didn't stop him had blood on their hands.
I'm a Justice O'Connor pro-choice person. Basically, she struck the balance that if you could take it out and it would live, its a baby, if you can't, then it isn't. My understanding is Tiller performed late term abortions. As I would view things, there are very few good reasons for doing late-terms, I'm open to hearing Tiller's side on that, maybe he only did legit late terms, I don't know and not being an O'Reilly viewer, I've never heard of the guy.
I've often wondered about this debate if the animosity level of the "debate" wasn't exacerbated by the undemocratic method of its legalization.
If one side of this debate legitimately and honestly believes that murder is being perpetrated on a massive scale on a daily basis, then I think eventually the people on the other side are going to have to come to terms with that in some way. I don't have the answer, but if the concerned side feels shut down and shut out, the normal reaction to that is violence. Not to say that is a legitimate response, just common.