As I understand what u posted…even in DnD lore, they are not considered pure evil. They just are conditioned by their innate poor tempers and cultural pack-like norms to do evil things. At least, that is how I read this.
Not really, no. This idea that the evil humanoid monsters are "Evil because of culture" would have to be a recent addition/retcon. If you look at the original Goblin (AD&D and AD&D 2e), you don't see anything about goblins being "driven to evil" because of peer pressure; they are evil and whatever society of theirs is encountered was formed around that malevolence.
