I have no training in philosophy so bare with me here. I often feel like the way people, including philosophers, talk about it is irrational. I am here to ask if you agree with me on the following. If you do not agree, why not? If you agree, why do I feel like people don't really talk about it in these terms?
We have a moral codex programmed into our minds by evolution because cooperation is advantageous for a tribe of humans (so it is utilitarianistic), and we are smart enough to be able to create a society with moral norms that cannot be broken without having to fear punishment by the rest of the tribe (so this behaviour egoistically sensible as well). As a member of such a tribe it is easier to act correctly (in the egoistic sense) by trying to act utilitarianistically, and even easier by acting according to an intuition we call morality.
An example would be: A schizophrenic murders someone and is judged not to be in control of his actions during the crime. Therefore he should not punished, because the punishment can not keep future candidates in his position from committing such crimes. On the other hand, if I murder someone, being in control of my actions, but maybe having good reasons to murder the person, a bad childhood and whatnot, I should be punished because this punishment will keep future candidates like me from committing such crimes.
Another example: Killing 3 random people to save 4 is wrong, not because murder is inherently wrong, but because it is not utilitarianistic as soon as someone witnesses the (unfair and surprising) murders, spreads the word, and thereby spreads fear among the livin to be randomly murdered.
The reasoning of people to derive these 2 things seems to be super indirect, arguing with free will or moraly etc. I don't understand why my way of thinking is not the norm, rather than esotheric "moral" arguments based on basically emotions and instincts. Actually, it seems like half of philosophy seems to make such esotheric arguments instead of just reducing ethics down to utilitarianism. In my opinion the question of "what is ethical" is already solved since Darwin. Ethical=Utilitarianistic.