Assad let Sunnis terrorists hide in Syria and cross into Iraq to kill US soldiers. Now they are properly thanking him for supporting their anti-American jihad.
Actually, I'd say he made the right move* in not interfering with the Sunni jihadists crossing into Iraq - Uncle Sam's $1T investment in Iraq simultaneously drained the coffers of Sunni financiers of jihad and killed off the most motivated jihadis to the point that they were too few to topple Gaddafi without NATO support and will be crushed by Assad unless NATO intervenes. GWB said "Bring 'em on". I view Assad's war against the Sunni rebels as the continuation of the battle to decisively break the spirit of the Sunni holy warrior. As with the defeated Axis powers, Sunni holy warriors must not only be defeated, they must acknowledge that they have been defeated.
* The only move he could make, given the political constraints of being an infidel ruling a Sunni-majority country.