To understand why Islam is so fundamentally violent as well as extreme, we first need to understand the basic relationships between the Abrahamic religions. I have thoughtfully created a visual aid to spare you from a lengthy explanation:
Now, we know Sharia Law is what the terrorists seek to impose over the world, it's what they impose on every new town and territory they capture. We also know that Sharia Law is incorporated into many Middle Eastern countries' governments. The Quran supposedly being the final revelations from God to a Prophet (Muhammad), and the Hadith being a collection of Muhammad's actions and sayings as a living person, we know that Sharia Law is the product of pure Islam and can understand why fundamentalist Christians and Jews, though also extreme, are not waging a modern Holy War against the rest of the world.
So, what do we do about it? Does the rest of the world have a right, or even an obligation, to step in against countries where unspeakable human rights atrocities are committed daily under the authority of religion? Where the basic rights to education and a sense of independent self are legally denied with the same justification?
Since 9/11, global terrorist death toll has been averaging ~15,000 deaths per year. In 2014 it jumped 30% up to 19,000 deaths and is on trend to continue increasing. The problem is growing both in the Middle East/Northern Africa and in Western countries as they begin to change their tactics and support lone-wolf style attacks claimed through social media, and that's just terrorism action. What do we do about the regular women who are killed in "honor" by their family members for simply being seen with an unrelated male?
Here are some spoons in addition to what I've posted:
Can a whole religion be held responsible for the criminal actions of a movement in its name in the same way as countries were held responsible (and still are being held responsible) for the criminal actions of a movement that started and grew to involve them?
Would we be more willing to impose international pressure on the situation if the countries in violation did not hold an important economic factor to consider? Does energy independence, alternative sources of oil (Central America, Keystone Pipeline, etc), and any people or groups standing in the way of their implementation play a role?