Root Causes of Ft. Hood Massacre?

Root Causes of Ft. Hood Massacre?
For what it's worth, on the rare occassions when I lecture on the topic of how extremists use Islam to justify terrorism (including sometimes at Ft. Hood), I often draw from these Middle East Quarterly articles:

"Contrasting Secular and Religious Terrorism"

"Peace of Jihad: Abrogation in Islam"

"The Religious Foundations of Suicide Bombings"

"Beheading in the Name of Islam"