My only other thought on this is simply:
If you disagree with Tiller and other late-term abortion doctors "murdering" babies, how does committing another murder make sense in a Christian worldview? Where is the parable by Jesus that spells that one out?
The answer is that it doesn't exist. Jesus is about forgiving others, and helping them be better Christians. Jesus, at no point, elucidated a policy where the most vile should be dealt swift and ultimate justice by their peers.
Time and time again, when I read Megan, it becomes obvious to me that she has no children. I do not mean this as a judgement. I mean it simply that a human's view of the world simply changes when they have a child.