A Good Man is Hard to FInd

This short story was about a family of six that goes on an adventure, but ends up in tragedy. The family is made up of a grandmother, her son, his wife and three children. They are heading for a vacation in Florida. The two young children named June Bug and John Wesley are very impolite and selfish, which upsets the grandmother greatly. After stopping shortly at a restaurant the grandmother remembers an old plantation she use to visit. After convincing her son to take the car down a dirt road to see the plantation they get into a crash. All of them survive the crash, but three misfits come along to cause trouble. The leader of the misfits is an older man who enjoys telling his life story to the grandmother. While he gets his followers to take family members at a a time in to the woods to shoot them. Terrified the grandmother tries to convince the misfit that he has good blood and is really a good man, but in the end he shoots the grandmother three times.
To me this is a very sad story, but in its harshness there is reality. I think most people want a fairy tale ending to every story, but in the real world not every thing ends happily ever after. I think that the title of this shot story "A Good Man is Hard to Find" explains the truth about people. That humans can't always be good, and that there is potential for good and evil in every human being. People can so easily go a stray and the way this misfit saw it was that he was a bad man and he might as well burn some houses or kill some people while he still had time on this planet.
I was confused on what the misfit was trying to say about Jesus?