Macbeth's own actions lead to his own downfall because it was his own choice to kill king Duncan and his choice to get assassins to kill his best friend Banquo and Macduffs family, lady Macduff and her child.
             Macbeth started good until he met the three witches and they put the thoughts into his head about been king and then all hell broke loose and he turned to crime to fulfill his greed he would kill all that stands in his way, then he begins to loose it, he goes back to the witches and they fill his mind with a false sense of security.
             In a way Macbeth's own actions lead to his downfall but in a way the witches had an input into his downfall because if Macbeth had never met the witches he never would have thought of killing all those people.
             Macbeth is initially seen as a great soldier, a fearless fighter who has loyally defended his king against a treacherous rebellion, however he becomes corrupted by evil and by ambitions. Lady Macbeth's strength motivates his actions; however once begun he realizes there is no turning back and he is forced to continue on his bloody path. He is also very impressionable which means he is very influenced by the words of the witches.
             I have no spur to prick the sides of my intent, but only vaulting ambitions, which o'erleaps itself and falls on the other. Macbeth seems to recognize that his ambitions will ultimately result in his downfall, but he still goes through with the murder of Duncan.
             "Bloody instructions, which being taught, return to plague the inventor" Macbeth says this just before he commits the murder of king Duncan he is talking about the prophesies that the witches told him, return to plague the inventor means that what goes around comes around, so by killing king Duncan he is sealing his own fate because killing Duncan lead to killing Banquo and that lead to Macduff going to England and Macbeth killing his family.
             ...