In part because my father was murdered by an Arab, I’ve made an effort to understand the impact of U.S. policy in the Mideast and particularly the factors that sometimes motivate bloodthirsty responses from the Islamic world against our country. As we focus on the rise of the Islamic State and search for the source of the savagery that took so many innocent lives in Paris and San Bernardino, we might want to look beyond the convenient explanations of religion and ideology. Instead we should examine the more complex rationales of history and oil—and how they often point the finger of blame back at our own shores.

America’s unsavory record of violent interventions in Syria—little-known to the American people yet well-known to Syrians—sowed fertile ground for the violent Islamic jihadism that now complicates any effective