True. Ayn Rand identified the proximate cause as altruism fully absorbed: the code that names self-sacrifice as the good and self-assertion as evil. Once a man accepts that the moral is the selfless, the humble, and the needy, then every instance of self-sufficient excellence becomes a standing reproach. The achiever who lives for his own sake is, by the altruist code, guilty precisely where he is greatest. So the better the man, the more he indicts the morality his haters have accepted, and they come to feel the good as an accusation.
But Rand dug beneath the ethics to the psychology, and this is where she located the deeper cause. She argued that the hater has made a fundamental choice against his own mind, a default on the effort of thinking, focusing, and pursuing values. Having evaded that responsibility, he faces a choice when confronted with greatness: revise himself upward, or destroy the standard that exposes him. The man who loves the good answers excellence with admiration and the desire to rise. The man who has betrayed his own potential answers with the wish to tear it down, because its mere existence reminds him of what he refused to become.
So the cause, in Rand's account, is ultimately metaphysical. It is a man's verdict on existence and on himself. The good is hated by those who have somewhere decided that the good is not for them, that reality is not theirs to master, that values are not theirs to earn. Rather than admit the fault lies in their own evasion, they relocate the evil onto the good itself. The excellence must be the crime, because the alternative is to indict their own surrender.
This is why she insisted it is not the good's task to apologize, dim itself, or seek the haters' approval. The reproach they feel is not something the achiever does to them. It is something they do to themselves, in the presence of a standard they abandoned.
Rand considered this the essence of evil, though she was careful to note it is rare in pure form. Most people are mixed, capable of both responses. But to the extent that a man hates the good for being the good, she held the source is always the same: he has turned against his own capacity to think and to value, and he cannot bear the living proof, in another man, that the turning was a choice and not a necessity.
“I don’t understand why people hate Elon Musk so much.”
It’s easy to explain.
Jealousy. Resentment. Envy. Stupidity. Those are basic.
Economic illiteracy and hatred of free speech also play a part.