"IS arose out of the Syrian civil war which can not be blamed on the West."

No it didn't. It was conceived of in Camp Bucca, an American prison in Iraq where the US were holding senior al-Qaida figures and other captured militants. It was formed in reaction to the Shia-dominant, US-backed government that had ignored the Sunnis.

Camp Bucca concentrated the most wanted insurgents in one place, in safety, and enabled them to form ISIS, to channel the anger of those who had survived the atrocities of Abu Ghraib and other US torture sites.

ISIS are a monster the west have created. They are a vicious, brutal reaction to the vicious, brutal interventionist policies the western allies have pursued. They are a pigeon coming home to roost, but they are bringing the gore to us instead of hiding it away as the western allies have done.

The west has little or no moral high ground, that was frittered away by Bush, Blair, Rumsfeld and their successors; even at home their own societies are riven by slaughter and and violence, some of their own citizens hellbent on slaughter whilst their fellows look on, too afraid to tackle vested interest or too greedy to surrender their own. We even export this sorry, sordid attitude to others at the end of a gun.

You couldn't engineer a fuck up like this if you tried, it could only be achieved through stupidity, greed, intolerance and plain nastiness, and every side is part of the gorefest.

As for the answer, it'll be lots of dead (mainly poor) people for countless years before we realise we were so distracted by our petty squabbles, boundless capacity for greed and adherence to out-of-date, divisive religions that we have trashed the planet and it's too late do a thing about it.