A somewhat different version of that world and of characters similar to the one he's acting exists in the games.
When building a character for acting one bases oneself in the script to "fill-in the blanks" of "how would this person feel in these circumstances", based on things like the past of that person, the world around them and past events (sometimes actors using Method Action will even during rehearsal enact an important events of a character's past which are NOT on the script, just to try and get an impression of how that might have shaped that imaginary person).
So it still makes sense that now, after he built a character based on the script's version of that world and of people like that character in it, he would avoid different versions of that world and those people.