Something that frustrates me about most historical fiction is that the hero is almost always out of place and time. The hero and his companions act and hold beliefs like a modern westerner, even when everyone around them doesn't. Even when the belief was so ubiquitous that it was held by 99% of the population. Somehow, your hero is always in that 1%.
This is even worse in RPGs because they offer you a choice, but that choice is usually limited to "be nice like a westerner" or "ignore it."
@newt As far as I tried in KCD you can kill everyone except story characters.
@newt True. You should be able to just lock yourself out of the story by killing a story character
@newt @matrix I'll also add that this is really only a consideration in a western rpg, where you're playing the role of "yourself" more than an established character. JRPGs are a lot more focused on the narrative and getting into the shoes of a specific character archetype. That is to say, there are varying degrees on how far any given RPG can go with its freedom depending on the experience it wants to offer.
I'd say that this changed around the time Mass Effect came out, with the games starting to force certain choices on the player.