Ziauddin Sardar has written an important article entitled The Struggle for Islam's Soul which analyses the roots of terrorist activities in Islamic history and thought. He writes:
While most Muslims abhor violence, some terrorists are a product of a specific mindset with deep roots in Islamic history. If Muslims everywhere refuse to confront this, we will all be prey to more terror.
It is very easy to draw simplistic conclusions about Islam and its relationship to violence. But Sardar explains some importantly nuanced understandings on this topic. Read the whole article here.