Andrew Bacevich has a better definition of what we Americans refer to when talking about “terrorism”

“…a violent outgrowth of chronic political dysfunction and economic underdevelopment affecting large parts of the Islamic world, exacerbated by deep-seated  sectarian divisions and the pernicious legacy of European colonialism and further complicated by the presence of Israel, all together finding expression in antipathy toward the West and especially the United States.”  LA Times

A complex problem, highly inconvenient for those who believe the only solution is to bomb them until the sand glows.