Leftists and Libertarians are people who base their entire philosophy on the belief that all these social rules are incidental, accidental, and irrational products of unthinking, prejudiced masses.
Strawman argument and absurdity on stilts. Nobody has this belief, much less leftists and libertarians. “Secular humanists” tend to think that morals and ethics are a necessary component of sentience i.e. an emergent property. That some humans prefer to think that these things were handed to them from upon high by a god is the result of tradition, belief, training, and an inability to grasp the concept of emergent properties.
It’s not a lot different than 20,000 years back many humans reckoned the world was flat and truly believed this to be so. They lacked the perspective at the time to deduce otherwise. And yet no matter what they believed about the gods the world still wasn’t flat. But once the concept was introduced then by the time of classic antiquity everyone knew the world was round.
If evolution is reality then morals and ethics being emergent properties is also real. Of course if you’re one who thinks evolution is about accidents then you’re certainly not going to grasp more advanced material. Intellectually you’re still at the “it is TOO flat” level.
