As the US, without showing any proof, assures the world that we have evidence that the Syrian government has used chemical weapons*(At bottom), we continually get reminded about what the mindset of the other side (See above).
-But what the other guys are doing are of no concern to the Obama administration.
The rebel forces appear to be overwhelmingly Sunni Muslim (The guys that we were always told were the nice Muslims - Shiites being the supposed bad ones), but the argument can be made that the government has a broader type of coalition:
"The new-found efficiency of Mr Assad’s men may owe a lot to his Iranian advisers. Armoured units of Iran’s Revolutionary Guard and other regular troops fought alongside Syria’s recently formed National Defence Force, welded together from so-called “popular committees” of pro-regime paramilitary shabiha and trained by Iran’s elite Quds Force. As well as about 6,000 regime soldiers, some 2,000 fighters from Hizbullah, the Lebanese Shia party-cum-militia that is sponsored by Iran, were thrown into the battle.
For all the West’s attempts to create diplomatic momentum before the planned peace conference in Geneva, incentives for Mr Assad to compromise may diminish thanks to events on the battlefield. After the fall of Qusayr he may believe still more strongly that he can hold out and perhaps even vanquish the revolt. State media hailed the fall of the town as the first step in the reconquest of rebel-held territory. “The solution is the army, not dialogue,” said Dareen Nusra, a housewife in Damascus....."