An evil driven by blind hatred: Suicide attacks in Egypt

Carried out by zealots who, by any rational criteria are dangerously deranged, they articulate an evil that challenges the fundamental beliefs of liberal, increasingly tolerant, western society.
How do we respond? With force to destroy the fascists behind the attacks? By turning the other cheek again? By working harder to end the conditions that seem such fertile ground for the radicalisation of emigrants who have, for cultural or religious reasons in deep conflict with our world view, refused to assimilate in their adopted countries?