Darwin doesn’t have to explain why you shed any particular tear. He just has to explain why you have tear ducts in the first place, and why those ducts can sometimes be activated by suffering that is not your own.8 Darwin must explain the original triggers of each module. The current triggers can change rapidly. We care about violence toward many more classes of victims today than our grandparents did in their time.9 Political parties and interest groups strive to make their concerns become current triggers of your moral modules. To get your vote, your money, or your time, they must activate
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