Why does the Left openly support Islam?
Both Islam and Marxism were concocted by the uberparasites of their times, Karl the First Trustifarian and the Big Moh'. Both doctrines must deny the Right to Life -- and thus the subsidiary Rights of Liberty, Property, Free Speech, Et Cetera -- of all persons. Both ideologies must do so in order to establish and maintain the reign of terror and death, in order to control and exploit the productive population, that their parasitic adherents need to sustain their otherwise useless lives. To accept the concept of the Right to Life that underlies the society of consent is for the Marxist and the Mullah the first step in an act of suicide.
So it should be no surprise that the Left is coming out in favor of silencing the critics of Islam. They feel that the enemy of their enemy is something they can use.