There was an interested relating article in the Grauniad today, George Soros: Donald Trump is doing the work of Isis. This video explains exactly how Trump is helping the Daesh recruiters.

I was just thinking this while watching the video, and before I scrolled down to see your comment. Spooky.

That's a nice strategy they got going there but it's fairly shortsighted. If you're mainly killing and terrorizing muslims, you're gonna run out of muslim supporters one day.
The same people whose families and friends you enslaved, raped and murdered won't help you.
The muslims that are somewhat moderate and far away from you will begin to understand that you are their biggest problem now, image wise and direct threat once your reach is big enough to touch them. They won't help you. They will look after their own interests, mainly deescalation.
Muslim nations will start seeing you as a problem as you hurt their economy, just consider how important tourism is for Turkey. Rich people will loose money. Money means more than faith.
Those true believers have many martyrs willing to die for the cause. The world has enough bombs for each one of them. No matter who presses that button.

They will fail. They will become insignificant or extinct. Somebody new will come along and fail as well. Repeat.

Its much simpler actually: The circle of violence. It started when the west thought it could bring their ideology to those countries. But Sunnis didnt want to live together with Shiites (the forming of Iraq and others). They didnt want to have foreign soldiers on their soil and adapt western lifestyle (especially Saudi Arabia). They didnt want Jews to get Israel, they didnt like to get invaded (Iraq and others), they didnt like the western coup detats (Iran and others), they didnt like to be afraid of being struck by a drone or cruise missile strike any minute (pretty much the whole region), and they didnt have the means to defend against their corrupt governments established or supported by the west or the attacks by the west.
Before this they were living at relative peace. Much more peaceful than we did live together in Europe in the last 600 years for sure.
Its pretty much desperation and has turned into normality now. They are also filled with hate due to their way of life, which puts honor very high and which the west doesnt understand. But you would be too if you have seen your culture get destroyed by other completely different cultures and seen your family and friends die by their hands for hundreds of years.
ISIS only struck that nerve better than any before. And thats why so many people are leaving to join them who are even living in Europe. Yet the west created them with their despicable foreign policy. And instead of learning from it, they are only making it worse by using these people for their own goals in Syria (that includes Turkey) and not changing their foreign policy.

A smart man once said: We shouldnt be wondering why they bomb us, we should be wondering why they dont bomb us much more.