I dunno. I think in this instance the GDs did add to the show. They were obviously religious people. They brought God up a ton. Used him as a shield, damned each other with him. Using the Lords name in vain may have purposefully been done to show just how angry they were with each other. Maybe they feel "Dag Nabit Devil Anse Hatfield, you'll get yours!" really didn't cover the emotion they were going for. To each their own. I thought while not 100% accurate it was still entetaining and maybe made a few people decide to look up the true history.