Psychohistory involves predicting the effects of large numbers of people and assumed that single individuals could not significantly change the future of the galaxy.
Without giving too much away, The Mule was a unique being who could not have been predicted, who could significantly change the future of a whole galaxy.
The Seldon Plan did have contingencies for this kind of thing, hence the Second Foundation novel.
Without giving too much away, The Mule was a unique being who could not have been predicted, who could significantly change the future of a whole galaxy.
The Seldon Plan did have contingencies for this kind of thing, hence the Second Foundation novel.