Why can’t science tell us what morality ‘is’?
In the trivial sense, science can certainly catalog the diversity, commonalities, and contradictions of cultural moral standards and moral behaviors.
But science is very good at teasing out underlying principles. What forbids determining such principles (if any exist) using the normal methods of science?
For instance, we might propose an observation like “Almost all moral behaviors are strategies for increasing, on average, the synergistic benefits of cooperation and are unselfish at least in the short term” as an hypothesis about what moral behaviors ‘are’.
Then we could evaluate its provisional ‘truth’ as a matter of science by how well this hypothesis meets criteria for 1) explanatory power for the diversity, commonalities, and contradictions of moral standards, 2) explanatory power for puzzles about moral behavior, 3) predictive power for moral intuitions, 4) universality, 5) no contradictions with known facts, and so forth.
Of course, provisional ...
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How to tell bad philosophers from good ones?
How to determine the "value" of a philosopher and his work?
How can we tell that e.g. Plato, Descartes, Kant or Marx were great philosophers while many around them weren't so great?
I'll start with analogy from different field. When we look back at history of science, we (at least in a simplified view) can say that the "good" scientists were those whose predictions about the nature of the world matched the objective reality. In science, what is true, is valuable, and vice versa. Some other criteria could be though of as well. One could say that Newton's and Einstein's theories were regarded valuable because they matched with objective reality AND explained things that weren't explained before AND could be used to build other theories and reasoning on top of them.
Now, what about philosophy? One could say that a good philosopher is a philosopher whose argumentation is good, i.e. convincing. But shouldn't in this case many lawyers be regarded as great...
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