Since 9/11, a lot of nonsense has been talked about the root cause of Islamist terror. The left has attempted to explain it as driven by "poverty" or "oppression", or American foreign policy, or Israel, or at least some sort of logical grievance.
But we are gradually coming to see that Islamist terror is in fact driven by a vile, totalitarian, hallucinatory ideology - Islamism - that has its own dynamic, and that is not based on any logical or rational grievances.
Many are now also realising that Islamist terror before 9/11 - such as in Israel - was basically the same thing. Arab terror against Israel is also fundamentally based on Islamism, not on logical or rational grievances.