Why You Should Think About Many Worlds in Probabilities at All?

Decision theory tells us that we should act as if the probability of getting different outcomes obeys the born rule. But this doesn't really scratch the itch of saying, i want to know why there's probabilities at all. A chip and i following ideas from le weidman pinpoint, where the necessity of probability is in the self locating uncertainty. D m i says: If regions across which a function can be analytically continued all contain the same information about the function, then quantum fields have analytic propert s. And how can a black hole in one region cause the information in different regions outside the event horizon to be paradoxically destroyed? Ah, i don't think the quantum fields