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I agree with 'Johnny Student' that one reason for the elite to want to present the world as complex is to keep them in jobs as the only people able to understand it. Another reason for wanting the same thing is as an explanation for the failure of their preferred solutions. They look around after decades of welfare/gun control/affirmative action and still see poverty/gun crime/blacks at the bottom of the heap. It is much pleasanter to bemoan the complexity and "stubborness" of poverty/crime/racism than admit that their solutions were just plain wrong. It also gets you a bigger budget.

Obviously in many ways the world is complex. But rather as physics can reduce multifarious phenomena to simple equations, I think you can dig down to some fairly simple ethical principles. The complexity comes in seeing what applies where.