It seems like they almost went the opposite way with the way they portrayed him, because there's so much about Stan that seems to completely negate the idea.

Which I can except--I just erase that little fact from his background and replace it with something that fits better. It's important that he was away for years and immersed in a job that was traumatizing, not that he was undercover as a white supremacist. Since they've done so little with it it doesn't take much adjustment on my part.