There are several options for the turning point. When Macbeth listens to and decides to kill Duncan fulfilling the prophecy. However, in Act III, Scene IV, when Macbeth sees the ghostly figures at the dinner. This is the ultimate moment when Macbeth realizes that there is no way out of his nightmare.
They were better off. Without the discovery of the uses of fire, mankind would not be here. Fire led to the rapid increase of newer, more advanced tech, such as a sword instead of a club.
