@farmerman,
My point is that the situation in Syria as described by contemporary news media is at once less complicated, more complex, and not nearly as shallower. Essentially, it's conflict between Sunni and Shia. Whenever a bunch of wild-eyed Sunnis want to claim some radical cachet, they call themselves Al Qaida. Remember that joker who called his organization Al Qaida in Iraq? He was a fugitive from Jordan, and had had no connection to Al Qaida. However, calling his "organization" Al Qaida signaled his Sunni sympathy and suggested a terrorist competence which he did not in fact possess.
It's the same thing in Syria. Radical Sunnis signal the populace that they are racical and competent by calling themselves Al Qaida, whether they are competent or not--and the evidence is that they ain't so hot.
Before 1970, when Hafaz al-Assad took power, the Sunni majority casually persecuted the Shi'ite minority. Forty years is not too long for the group memory to function on either side. Hezbollah was created during the Lebanese civil war by agents of Iran's Revolutionary Guard to counter the predominance of Christian militias funded and supported by Israel. People squawk about Persian support for Hamas, but it's a drop in the bucket compared to what they give to Hezbollah, on the order of ten to one or more. The Revolutionary Guard selected the Twelver Shia portion of the Lebanese population precisely because they were Twelver Shia. Proportionally, the Lebanon has the largest Sevener Shia minority in the Muslim world--the Revolutionary Guard didn't care if they lived or died. There are also Sunni Muslims, Ismaelis and Druze in the Lebanon, about whom the Revolutionary Guard also did not give a rat's ass. They were only ever interested in supporting their co-religionists, defined on a very narrow sectarian basis.
The obsessive hatred of Israel in Iran dates back to the days after the coup against Mossadegh in 1953, instigated by MI6 (or whatever the Brits were calling it then) and organized and carried out by Central Intelligence. After the successful installation of a western-dominated government under the Shah (and that goes back to the early 1940s when the Allies wanted a supply pipe-line to the USSR), Israeli Mossad agents set-up, trained and supported SAVAK, the Shah's not terribly secret police and organ of state terror. Central Intelligence became disenchanted with their over-the-top activities and withdrew support, so Mossad stepped in to provide support and to even carry out operations. Mossad agents kidnapped people and tortured and murdered them. Small wonder the Persians obsessively hate Israel.
There is no such thing as a simple explanation for the factionalism and fighting in the middle east.