The comment I'm responding to makes it sound like this stuff is beyond democracy and voters have no choice. That's not true at all. Voters just consider bombing others to be an important activity.
It seems that certain interests will carry through no matter what.
There's a conspiracy that's been floated for a few years and is resurfacing that the Saudis and Qataris have been pushing for a pipeline from Qatar to Turkey via Syria, and Assad has been a thorn in their side preventing diplomatic means to get it done. But there's also sound arguments against this [1], although the source I found suggests that this is directly tied to US access to bases in the area (possible) and thus aligning with SA, Qatar, and Turkey (perhaps in opposition to Russia/Iran/Syria). I'm not sure anyone really knows what's going on at this point. If I had to guess, it probably ties into everything from oil to archaic alliances dating to the Cold War and even military expenditures.
The Israelis may have a part to play in all this, too, but in my mind, I don't see what benefit they'd gain by continuing to destabilize the entire region. Then again, I guess you could argue the same point for every other actor, and perhaps there's an advantage behind encouraging your adversaries to go for each others' throats every few years (dangerous!).
Another protracted war in the Mideast is the last thing we need... sigh.
(Note: I'm just speculating here based on what I've read over the years and my own opinions and biases. This is probably entirely wrong.)
[1] http://www.truth-out.org/news/item/37685-the-war-against-the...
Second, Israel already illegally occupies a portion of Syrian territory, the Golan heights. And has no intention whatsoever of giving it back. A torn country is the best way to make sure that the Golan Heights will never go back to Syria (which might not even exist anymore) (check [1])
The other reason I just found it in the news this morning, though it doesn't surprise me in the least. "Prime minister Netanyahu is pressing to ensure that any agreement that will end the war in Syria will include buffer zones on Israeli borders with Syria and Jordan. [2] " Now, we know what Israel does with "buffer zones". The West Bank is, technically, a buffer zone. They're just moving their own civilian population in it.
[1] https://www.google.nl/search?q=netanyahu+war+in+syria+golan+... [2] http://www.haaretz.com/israel-news/.premium-1.782143