A Good Man is Hard to Find

I think "A Good Man is Hard to Find" starts out by trying to make us think that the son is not being a very good person by not taking his mom on vacation to where she wants to go. Then the two children who come off as naughty, by the way they speak "freely". The girl makes a comment about the place being a dump when they stop to eat, and even with the Misfit she make the comment "What are You telling us what to do for?"
After the accident the "goodness" changes drastically. The Misfit with his two accomplices pull over with no intentions of helping the family. They view the children and take them all to be shot with their parents. That is just heartbreaking and one was just a baby. The grandma tried to talk the Misfit out of the killing, by saying she knows he comes from good blood and that he just needs to find Jesus. In the end he kills her too. I seems that they have no feeling what so ever. 
None of the character's stood out as more "good" then the others. The son seemed to try to protect all by reasoning, the mother just agreed that it would be best to go back by her husband and the grandma tried to plead the 3 men from killing them all.