'Vayizak za'akah, gedoloh ad me'od', 'vayistom eisov es yaakov'.
I think that perhaps the initial pain and scream are understandable, he was human after all, and it was an immense shock and disappointment. However, here is an amazing example of how our resentments can cause SO much damage. Eisov should have said, "ok, I don't understand why, but Hashem wanted Yaakov to get the brochos and not me."
The point is, he never dealt with the resentment, he piled it up so high and look what suffering it has caused our people through the many centuries since that fateful day.