Reporting war crimes in Syria: the government versus the rebels

Look at this headline in the Washington Post yesterday:  "SYRIA, Government bombs kill 37 in Aleppo.  And you read:  "Syrian government aircraft dropped barrels packed with explosives on opposition-held areas of the contested northern city of Aleppo on Sunday, leveling buildings, incinerating cars and killing at least 37 people, including 16 children, activists said."  So for this crime--and the government is capable of such crimes, of course--the sources are anti-regime "activists".  And then you read this:  "The Observatory, which monitors the conflict through a network of activists in Syria, said fighting continued Sunday in Adra, northeast of Damascus, after an al-Qaeda-linked rebel faction attacked the town Wednesday. The death toll there has risen to 32, the Observatory said, mostly members of Assad’s Alawite sect but also some Shiite Muslims and Druze."  But the second war crimes by rebels is better documented because the Syrian Observatory, an element of the Syrian opposition, confirmed it although it deflated the figures of casualties (the first day, it claimed only 12 were massacred).  But why does the headline only cover the war crime by the regime but not by the rebels when the text of the piece contains war crimes by both sides? The answer: when it comes to Syria, there is no news or even analysis.  Just propaganda.