The fruit of violence is grown in the soil of all worldviews...
Christianity: the Crusades, abortion bombings, "Christian Militia" murder plots, etc.
Islam: 1993 Bombay bombings, 9/11, Mumbai train bombings of 2006, recent train bombings in Russia, etc.
Atheism: Josef Stalin (killed between 20-60 million), Mao Zedong (killed between 50-70 million), Pol Pot's Khmer Rouge, etc.
Buddhism: Sri Lanka Civil War (between 80,000 and 100,000 dead in one of the longest wars in modern Asia)
Judaism: on-going violence against Palestinians in the Middle East (over 2 million Palestinians killed in warfare since 1948)
There is something in the human heart that is so prone to violence and oppression that it can twist any philosophy, worldview, or belief about God into a warrant for violence. Liberals aren't "bad people". Conservatives aren't "bad people". People are bad people.