But have these people not been slaughtering each other over minor religious points long before the West even discovered their region? I get the impression that you believe that the West is responsible for these people killing each other for whatever reason they feel fit..
The Arab Spring was about politics not religion.
The initial demonstration by the people in Syria was a peaceful demonstration. Assad used force to quell the demonstration so USA demanded his abdication despite his agreeing to democratic elections and other reforms.
When he didn't abdicate US started arming, supplying and supporting the demonstrators, (of course that was good for the US economy as well, but that's being cynical) and it all spiraled out of control.
Assad would easily have prevented and defeated the rise of daesh without the interference of the west.
Of course Assad's hard line towards Israel had nothing to do with it.
Assad killed (from March to May 2011, the timeline before civil war really started) about 1,000 protesters.
Since, due to the support of the anti-government rebels by Saudi, USA and other western nations, there are about 250,000 dead (figures suggest somewhere between 150,000 and 350,000) and more than 11,000,000 displaced. The population that remains is basically homeless and starving to death. And there's no end in sight. It's even difficult to imagine what the end result will be.
Saudi is Sunni and many of the rebels are Sunni.
Assad is Shia as is Iran and Lebanon. But Russia is not even Muslim.
Daesh is mainly Wahhabism, which is an extreme form of Sunni, yet daesh (extreme form of Sunni) and other rebels are also fighting each other.
It's about power and control, not about religion. So do not try to confuse the situation by blaming Muslims or Islam.
Similarly, there were no Al Qaeda in Iraq until Saddam was no more.
The interference by US and other western countries is claimed to be about democracy, and I could be cynical and ask is democracy worth the cost, except that's it's not really about democracy. It's about power, control, influence and who's acceptable and who isn't.