“Human nature” is a concept that, in your mind, is unchanging and immortal. It possesses infinite power. It acts upon the material world, but the material world cannot act upon it. It is also only brought up when anyone mentions the possibility of actually making the world better. “We can’t have communism because of human nature”—even though the concept of private property itself did not exist before the invention of writing. Communism was the norm for 95% of the time humans have spent on Earth.
If human nature is infinite, immortal, and unstoppable, if the material world has no effect upon it, how is it different from god?
You are caught in quite the bind here. If you admit that human nature can change, that means that communism is possible, and that the entire liberal project is a sham. If you refuse to admit this, you instead admit that human nature is divine, and reduce yourself to the status of a religious lunatic. Which will it be?