As tempting as it may be to conceive of an opponent as "evil" and oneself as "good," the truth is seldom so clear-cut: something happened, someone felt boxed in, someone misunderstood someone else's intentions, one thing led to another. But humans can't know everything and will always search for a neat mental model. Rather than "good vs. evil," try "zero-sum vs. positive sum." Instead of trying to distinguish "good" from "evil" as a route to understanding Mideast politics, try distinguishing those who view regional political affairs as a zero-sum game from those who view the world as a positive-sum game.
Positive Sum History
"Positive-sum history" is the optimistic view that history shows the development of human civilization in the direction of an ever-broader definition of the common good. The optimist sees history as progress, believing that as education spreads it also deepens, so we can learn from history. According to this view (which one may call a "religion," since it must be taken mostly on faith), the barbarism of the 20th century will teach us the value of international law and democracy, with both institutions used for the good not of a class or ethnic group but of mankind.
"Zero-sum history" pessimistically interprets history as always adding up to the same thing; it's either them or us. The pessimist sees history as repeating old mistakes since human DNA preordains that hubris will trump humility. According to this view (which may be called "realism" because most historical evidence supports it), all issues are zero-sum and all goals are short-term.
The Power of a Mental Model