This scene Thursday afternoon captured several basic facts about the war in Syria, which is pulverizing a city that in calmer days was one of the jewels of the Arab world. First, there aren’t enough weapons for the rebels to defeat Assad’s forces, and almost every Syrian I talked to thinks this is America’s fault; second, the commanders of the Free Syrian Army are trying to exercise better command and control over what has been a disorganized, ragtag operation; and third, in this chaotic and underresourced fight, the power of the Salafist jihadists — who ask only to be martyrs — appears to be growing.