Because many right wingers are hateful of Islam, and left wingers have called for Muslims to be left alone and treated with respect. You'll see that history often repeats itself. In the 1920s they referred to the "Jewish problem" and now they refer to the "Muslim problem". Look how the former turned out, and look out the latter turned out in the forms of coups, toppling of governments (for instance, in afghanistan the taleban actually offered to extradite bin laden if provided with proof, but.....the US carpet bombed and killed 15,000 civilians, and In iraq, the infamous example), and in the ignoring of persecution of minorities in russia (chechyna), kashmir, rest of india, etc.) and in the genocide of uighur muslims all based on the lie of "the war on terror"