He didn't change the game because they were intentional "evil messages," he changed the game because tons of people complaining about it where giving his game a bad name.
About the whole Hell thing, I'm pretty sure your looking into inferences that aren't there. It was the fire temple made into a volcano (I don't remember the plot all perfectly but wasn't it a place of worship for the Gorans?) thus you'd expect it to be hot and fire and brimestone-ish.