He argues as well that “political Islam” — jihadism — constitutes “the most coherent and deadly mass-murderous ideology since Nazism.”
That "he" is Daniel Goldhagen and it's in a new book he has just published:
WORSE THAN WAR
Genocide, Eliminationism, and the Ongoing Assault on Humanity
Illustrated. 658 pp.
His reviewer, James Traub, thinks:
by lumping together largely peaceful groups like the Muslim Brotherhood with Al Qaeda, Goldhagen turns political Islam into an eliminationist bogy. Moreover, even Al Qaeda, with its ideology of mass murder, has not been able to marshal the resources of a state to attain its ultimate goals.