Mystery and militancy in Islam
[...]Then there was Ayatollah Ruhollah Khomeini of Iran, who showed that a radical, violent Islam was not only possible in the modern world but also exportable to the West.
He said in 1984: 'War is a blessing for the world and for every nation. It is Allah himself who commands men to wage war and to kill.'
Killing them, indeed, was doing them a service: 'If one allows the infidels to continue playing their role of corrupters on Earth, their eventual moral punishment will be all the stronger. Thus, if we kill the infidels in order to put a stop to their (corrupting) activities... their eventual punishment will be less.'