With tens of thousands of Pakistani Muslims marching in favor of Koranically-inspired assassinations and thousands of Muslims elsewhere demanding the West adopt Islamofascist blasphemy laws, the more that appears to be the case.
Islamic terrorists simply do the dirty work that most Muslims don't want to get their hands messy with.
UPDATE: To put this in another context, suppose a Chinese nationalist mafia gang (say, the Bamboo Union) had nineteen of its members hijack an airplane and crash it into Taipei 101, murdering 2,500 Taiwanese. A few years later, the gang detonates a bomb in the Taipei subway, killing a few hundred. And a few years after that, the gang assassinates ten journalists at a pro-independence newspaper – in broad daylight.
Meanwhile, following each atrocity, thousands of Chinese in China march in support of the terrorists, and the Chinese government shelters the leaders of the mafia gang responsible.
Under such circumstances, it would be beyond ludicrous to maintain that Chinese nationalist ideology (and the Chinese themselves) had nothing to do with it.
(Beyond ludicrous, though Joe Hung of Taiwan's pro-Communist China Post would be more than willing to give it a shot.)
UPDATE (Jan 24/15): Tens of thousands of free-speech-hating Muslims march against Charlie Hebdo in Afghanistan, Pakistan and Indian Kashmir.