Morality is essentially a suite of psychological mechanisms that enable us to cooperate. But, biologically at least, we only evolved to cooperate in a tribal way. Individuals who were more cooperative with those around them - could outcompete others who were not. However, we have the capacity to take a step back from this and ask what a more global morality would look like. Why are the lives of people on the other side of the world worth any less than those in my immediate community? Going through that reasoning process can allow our moral thinking to do something it never evolved to.
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