If there is no god, why do people behave in a moral and ethical manner?
One answer might be long-term self-interest: if you never tell a lie, for example, you will develop a favorable reputation among other people which will allow you to participate in all sorts of activities of which you would never be a part otherwise.
Another answer might be "big picture" self-interest: people usually achieve more and have higher standards of living when they collaborate compared to when they compete: "competition" only works as a motivator when embedded in a broader collaborative structure first (i.e., if everyone plays by the rules, we aren't deliberately trying to injure a competitor because we don't want them trying to injure us and so we all place voluntary limits on our behaviors to promote a better outcome for all).
While these answers are all well and good, there seems to be something missing: to be motivated SOLELY by self-interest, no matter how you dress it up, seems like a somewhat barren life. ...
There are philosophers who question even the possibility of altruism --- and a lot of my students as well - but it is an empirical fact that there are countless examples of atheists who have sacrficed their lives for a cause -- for others. I suppose they did it either because of their sense of inter-connectedness. But as non-believing enviornmentalists attest, being willing to sacrifice for a world and people with whom you will have no contact - does not seem to require belief in God. Unless, perhaps we wanted to argue that such people are irrationally going against their own self-interests - and if they really thought matters through they wouldn't spend their time trying to make sure that the beaches were clean for people when they themselves were dead. A strange kind of argument it would be - stop doing these noble things because all rational activity needs to be based in self-interest. Can there be a rational motivation for self-sacrifcing behavior that is not anchored (have to love the metaphors)...
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