Tiller's cold-blooded murder was a needless tragedy perpetrated by a lone kook who is not representative of the vast majority of the pro-life movement. Murdering abortion doctors does not stop abortions. Other people will simply step in and take their places. What stops abortions is changing the hearts and minds of people seeking and performing abortions. That is the ONLY way that works and the ONLY way abortions will ever be stopped. The Bible does not say, "Do not murder, except..." It said "Do not murder" PERIOD. (That goes for both sides of the abortion issue.)
That being said, as disgusting and wrong Tiller's murder was, it is almost as disgusting and wrong for many in the pro-choice camp to use it to condemn all pro-lifers. Sadly, hardly anyone on the pro-choice side denounced such condemnations. Some even supported them.