Taliban take revenge for Koran burning but do nothing for the mosques being shelled in Syria ?

The above video shows shelling taking place in Syria, this and other videos on YouTube clearly show that there is no hesitation in shelling mosques.

I want to understand how the Muslim community cannot be standing up in protest, especially considering the recent events surrounding the U.S. accidental burning of the Koran and the revenge attack taken by the Taliban (clip shown below).

Although I don't abide by the burning of religious books of any sort, surely the lives being wiped out in Syria are much more important don't you think?