This is a tragedy. What Dr. George Tiller did as one of the few providers of late-term abortions in the country was reprehensible, but it is not within our rights to commit murder to end that which the government has declared legal.
Don’t misunderstand me. I don’t advocate remaining passive when the government advocates evil, but God doesn’t need us to wield His sword. “‘Vengeance is mine,’ saith the Lord; ‘I will repay.'”