Demon power is a driving force. 
Jesus declared that in the last days iniquity shall abound.
          Matthew 24:12, And because iniquity shall abound, the love of many shall wax cold. He was speaking in broader terms than just man's inhumanity to man.
                  He was talking about satan's last assault on the human family. Knowing his time is short, satan releases his demonic forces to do violence and take peace from the earth.