Cain killed Abel

In Genesis 4:8, Cain kills his brother Abel.
In Cain, there was hatred toward Abel, thus he killed Abel. No matter what the situation is, the simple point was that there was hatred in Cain which caused him to kill Abel.

In Genesis 33:4, Esau was about to kill his brother Jacob, but he "ran to meet him (Jacob), and embraced him, and fell on his neck and kissed him", and they wept. In Esau, there was hatred toward Jacob, but somehow something happened to that hatred and Esau did not kill Jacob.

In these two similar stories, similar point was there was hatred, and the different point was in Cain that hatred was not dealt with but in Esau that hatred was somehow dealt with.

Therefore, the problem is that there is hatred and what has to happen is that hatred has to be dealt with. No matter what kind of logical explanation is given to justify the situation of either Cain or Abel, the fact is the existence of the hatred, and as long as this hatred exists, every logic and explanation ends in vein. Therefore, we need to figure out the way how to deal with this hatred and how to eliminate it. It seems that God couldn't do anything about this part. Somehow God had to let them deal with this situation.

What I am saying is that you cannot just blame people for what they do to you no matter how unrighteous it might seem to be. You cannot ignore the fact that they hate you for some reason and that hatred might have caused them to do evil things to you. You need to reflect on what could have caused them to hate you. What was your part which you could (or must) make a change, so that you could cause to eliminate that hatred? Especially if it seems that God cannot do so much to change him during this situation, it is my part to make a change. Otherwise, you may win a battle, but what if you lose the war?