You are underestimating the power of evolution, culture and human nature. The key is in something that you said.

When we say that something is good, do we simply say it to put a adjective at random, or do we say it because we perceive that, in some way, that is what will give the best result?

As evolution, cultural values and circumstance have influenced human beings, they have imposed a certain common sense, an instinct, involuntary impulses both on the body and the mind.

What this means is that it's not for "no good reason", it's a very good reason, and it's that we perceive it as such. If I see that a cup is red I'll say it's red. The difference is that this perception lies within our genes, our culture and our minds.

However, as it is not an ultimate truth beyond our bodies but a truth within ourselves, what is "good" is different for every person. Evolution and culture have inserted behaviour guidelines so deep into us that we perceive them as as intensely as the truths outside of us. So if someone says something is good, they say it for a good reason: they perceive it as such.

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