Just the presence of a CPC in the vicinity of an abortion clinic ups the potential for violence. A recent survey by the Feminist Majority Foundation of women’s reproductive-health clinics nationwide found 32.7 percent of clinics located near a CPC experienced one or more incidents of severe violence, compared to only 11.3 percent of clinics not near a CPC. (Severe violence includes clinic blockades and invasions, bombings, arson, bombing and arson threats, death threats, chemical attacks, stalking, physical violence and gunfire.) [Kathryn Joyce, "Right-Wing Christian Pregnancy Centers Linked to Violence," Ms. Magazine via Alternet, 2010.11.11]
If there are enough passionate Christians in a community to start a crisis pregnancy center, I would like to think there would be enough passionate Christians to strengthen the community's resistance to violence against fellow citizens. Alas, too many Christians appear willing to use un-Christian tactics to achieve their political goals.