It would be unbearable to live a life believing that things like beauty, love, knowledge and life don't matter, and any philosophy that claimed it would be completely alien to me.
At the same time, looking at altruism in animals and evolution of social behaviour makes it pretty obvious that our instincts and culture for good evolved for practical survival reasons.
Surely it is a bit of a stretch to suppose that by fluke we evolved the beliefs and values that precisely match what is really good and really matters? I'm sure this is a pretty standard question that lots of philosophers have asked, so what kind of answers are there, and how can we decide what is really good or ethical?
Does it have to be a fluke that we have evolved in the way you describe? Our perceptual and conceptual apparatuses have evolved such that our perceptual beliefs largely match what is "really out there," and so why should it be a surprise (or a fluke) that our ethical beliefs match what is really good? The point of this question is merely to point out that the fact that we have evolved to think a certain way is not by itself a good reason to reject that way of thinking. That said, your concluding question is a challenging one. How can we decide what is really good or ethical? This question can seem particularly vexing if we think that the laws of morality or the "rules of life" must somehow be "out there" in the world, waiting like the laws of physics to be discovered and understood. But philosophers have long questioned whether values must be "external" in this way in order to be genuine or real. Perhaps our judgments about what matters--about what is valuable or moral or rational--are not...
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