When you're absolutely convinced that God is on your side...
than you can rationalize that anything you do is approved of by God. Perhaps some of the most extreme Islamofascists actually want to provide a backlash by non-Moslems in order to get the Moslem world to rise up and destroy the Infidels. If so, they'd be following the playbook of such intellectual illuminaries as Charles Manson and Tim McVeigh. Manson believed he could spark a race war and McVeigh thought he could provoke an anti-government uprising.