Family Rivalry

In chapter 18, they talk about the family rivalry between the Grangerfords and the Shepherdsons. While i was reading this, I thought that it was ridiculous that they are still fighting and killing people from the other family 30 years after the original conflict. The two families have gone on fighting and killing people of the other family for so long. At a point in this chapter, Buck tries to shoot Harney Shepherdson. I was shocked when I was reading this because Harney did not do anything to Buck, he was just riding his horse. Even though there were a lot of things different back then, I would never have thought this would be happening between two families.