He who guards your life knows it, and he will repay each one according to his deeds. If it is within ones power, by whatever means available, to save a person about to be put to death, then that person must be saved according to this verse.
Horrible violence is known to have taken place in abortion clinics and is continuing to take place.
The rationale that one should be non-violent is ludicrous when horrible violence is unquestionably currently taking place by abortionists and their assisting staffs. I have also heard some say that they are praying against abortion. God has already demonstrated by His inaction that He is waiting for us to take action. He has given creation into our custody. How we accept or reject our responsibilities in this life determines how we will be judged on the final day.