It’s not a particular satisfying answer to anyone since the Bible makes no case that Esau was evil. I fact it paints a very sympathetic picture of him when Esau and Jacob meet, and Jacob was afraid Esau was about to kill him, Esau instead embraced him and reconciled.
Then he raised his grandson `Amaleq to take vengeance on his brother.
I doubt very seriously you accept the Oral Torah, but without this it is impossible to get the true message.
Actually, the original Hebrew uses expressions and idioms that leave little doubt about Esau’s poor character.
“A man of the field”, for example, is an idiom indicating an idler. Even the plain text states that Isaac and Rebecca were very disappointed with Esau’s choice of wives. Later, Esau makes matters worse by also taking a daughter of Ishmael. When Esau bestows a kiss on Jacob when they meet again, the scroll text marks the word ‘kiss’, indicating its problematic nature. Esau’s death is not mentioned, another indication that he was not righteous.
In rabbinic literature, Esau represents Rome, and so the interaction of the brothers represents Israel and Western Civilization.