Before you can correct a problem you have to know what it is. We are addressing the symptoms, not the root issue.
These terrorists ARE acting on what the Koran says:
[2.193] And fight with them until there is no persecution, and religion should be only for Allah
[8.39] And fight with them until there is no more persecution and religion should be only for Allah; but if they desist, then surely Allah sees what they do.
[9.29] Fight those who do not believe in Allah, nor in the latter day, nor do they prohibit what Allah and His Apostle have prohibited, nor follow the religion of truth, out of those who have been given the Book, until they pay the tax in acknowledgment of superiority and they are in a state of subjection.
[9.123] O you who believe! fight those of the unbelievers who are near to you and let them find in you hardness; and know that Allah is with those who guard (against evil).
...just to cite a few.
The next step, again, what should have been the first step, is creating an environment where those enslaved to Islam are free to leave it's clutches w/o fear of muslim reprisal or "justice."
As to identifying the roor problem, what is anyone believing in the Koran supposed to believe when they read veres like the above or similar or supporting verses???
Those were just a handful found among the first 9 chapters, barely 5% of the Koran. I don't understand why anyone, that has truly read the Koran that is, has any difficultly understanding terrorism around the world, almost all of which is muslim sponsored and conducted.
As well, just about all of the worst nations where human attrocities and genocides are occurring or have occurred recently are in muslim dominated nations.
As long as people don't have the gumption to get to the true root cause, the problem will never be solved.
To think that such a society, as uncivil as they've been, and as defined by the above references straight out of the Koran, can peacefully coexist with Judeo-Christian nations is laughable and defies every shred of common sense and reason.
It's really simple folks, their (muslim) idea of "peace" is our (non-muslim) subjection to them, paying their tax, and being relegated to third class citizens. It really is that simple.
The question is "what can be done about it?" The answer to that is obvious. But to think that true Koran believing muslims en masse can peacefully coexist with western Christianized cultures is absolutely baseless.
As long as political leaders try to make Islam what it is not, then there will be no real progress in this area. The world went through the same exact exercise with Hitler. The primary difference being that Hitler simply believed that it was a different core of people that should dominate the earth and put others, predominantly Jews, but Christians and others also, into subjection and even death. There is little difference between the two.
The shame of it is all of the people in the muslim world being held in the shackles of Islam for fear of the ramifications of not doing so, namely death, and usually violent death. If muslims are willing to do this to their own people simply considering other philosophical options, then what is the world to make of mainstream Islam???
Addendum;
Is it any wonder that few muslim controlled nations aren't in the dark ages, very realistically, and utter third world nations!
The few nations that aren't got that way due to American blood and toil having built the "goldmine" of the world in the oil fields for them and then handing it to them lock, stock, and barrel at no cost to them!