The many worlds these other worlds you just have no way to interact with and so you can basically ignore them. You could say well I feel very diversified so in my life I can take all kinds of risks because I know in the other lives out there they're meeting different faiths. Ordinary standard decision theory has you looking down a game tree and very quickly the game tree has millions and billions of copies of you. Down the game tree of almost any game there's vast numbers of you down there but that doesn't mean you're willing to take more risks about the more distant future. Because there's so many versions of you there you're still worried to have more of them and not less