What if you believe in DKRUDT, the “Dick Kick’em rewards you” decision theory?
Seriously though, Newcomb’s setup is not adversarial in the same way, the predictor rewards or punishes you for actions, not beliefs. Your internal reasoning does not matter, as long as you end up one-boxing you walk away with more money.
How well can you predict what will be good in 100 years? For perspective, given the contemporary zeitgeist of 1923, rather than knowing all we know now, what would have been considered a great policy to enact then that would take effect in 2023?