There is a schizophrenic attitude and a schism among leftist thought on how to view extremist Islam just as the right is divided on how to view China. Many in the left see Islamic fundamentalism as an assault against their deeply held belief in secularism and the rights of women. Others on the left see Islamic extremism as a reactionary force against Zionism and encroaching capitalism. The apologetic left blames America at all cost and worships at the altar of mutilculturalism. To break it down on the left, I think the divide is against where your stronger loyalties lie- secularism or multi-culturalism.
I think this quote applies here:
Debate would be a lot more productive if we stopped telling other people what they believe and instead discussed what they actually believe.