The many Islamic radical groups (and older secular Arab radical outfits) are, for the most part, siding with the government [and] providing muscle to hunt down and capture or kill demonstration organizers. These terror organizations have had sanctuary in Syria for decades, and many feel that a reform government would likely end that. Islamic terrorism has become unpopular in the Arab world since al Qaeda’s large scale attacks against Moslems after the 2003 U.S. invasion of Iraq. Syria is the last decent place where a terror group can operate, openly and effectively. Somalia and Yemen are very distant second choices. Thus a lot fewer Islamic terrorists are sneaking into Iraq from Syria these days, as they are needed to fight the revolution.
Once again, we see that jihadis can work with secular dictators. Fancy that.