The people described in Roggio's piece are not freedom fighters, they're savages, and anyone who attempts to ennoble them by referring to them otherwise is morally complicit in their despicable crimes.
If the al Qaida "freedom fighters" ever prevailed and imposed their Islamist tyranny on the people of Iraq would the Left still praise them? As long as they were still at war with the West, I'm afraid they would. Some on the Left will praise anyone, no matter how evil, who is seeking to kill Americans and destroy America. It's been that way ever since 1917.