I need help on who is to blame for everything that happened in the storie in the story? She laughs at Macbeth's belief in the witches' prophecy, making him angry enough to kill the king.

She is hungry for power. She becomes successful in altering his ambition and appears to be the dominating individual in the relationship.

Lady Duncan's actions may give impetus to Macbeth but it is ultimately the three witches prediction of him becoming King of Scotland that ignites the spark within him to kill King Duncan. What is Lady Macbeth's role in Macbeth's decision to kill the king? Macbeth is seen to be the one that is responsible for Duncan's murder as his hands were the ones that actually killed King Duncan, however, on closer inspection, there are other influences in Macbeth's decision. From the very same speech and small implications from the letter, Macbeth was ambitious enough to want to be the King, but would not think of murdering Duncan. Lady Macbeth suggests to her husband that they kill Duncan so Macbeth becomes the king, at first Macbeth doesn’t agree with his wife, he is happy to let things take its course. Also Macbeth kills Duncan without any further discussion with Lady Macbeth.
He made these final decisions and continued with the killings to cover Duncan’s murder. Macbeth possesses enough self-awareness to realize the dangers of overzealous ambition. Macbeth, by the end of his first soliloquy, makes the final decision to not murder the King because in his point of view, “Duncan both born his faculties so meek” (i. vii.

Responsibility for Planning to Kill Duncan in William Shakespeare's Macbeth The witches, Macbeth or Lady Macbeth. The killing of Duncan starts an unstoppable chain of events in the play that ends with the murder of Macbeth and the suicide of Lady Macbeth. Had she not done so, he would never. The three main influences to Macbeth's decision are Lady Macbeth, Macbeth and the Witches. In one way or another all of these characters are connected and responsible for King Duncan's murder. “Thou wouldst be great; Art not without ambition, but without the illness should attend it.” (1.5.19-21).

One of the more interesting aspects of “MACBETH” is that it is not certain that the witches do lead to Macbeth’s downfall. She warns Macbeth that if he does not kill the king, his children will go hungry and likely die. And yet, the temptation to carry out the witches' prophecy is ultimately too strong for Macbeth to curb his ambition There are two factors which influence Macbeth's decision to kill King Duncan: 1. his own growing ambition and the desire to become the next king; 2. his wife's insistence on killing the king so that he can become the next king.