How ignorance leads to kill banquo?

Macbeth's ignorance of the consequences of his actions ultimately leads to the death of Banquo. When the witches first prophesy that Macbeth will become king, he is immediately consumed by ambition and begins to plot Duncan's murder. He is so focused on achieving his goal that he fails to consider the moral implications of his actions or the consequences they might have for himself or others.

After Duncan's death, Macbeth is plagued by guilt and paranoia. He begins to see Banquo as a threat to his throne, and he eventually decides to have him killed. However, Macbeth is unaware that Banquo's son, Fleance, escapes the assassination attempt. This oversight proves to be fatal for Macbeth, as Fleance later returns to Scotland with an army to avenge his father's death.

Macbeth's ignorance is also evident in his dealings with the witches. He is so desperate for power that he is willing to believe anything they tell him, even though he knows they are capable of deception. This gullibility leads him to make a number of mistakes, including the decision to kill Banquo.

In conclusion, Macbeth's ignorance of the consequences of his actions and his gullibility in believing the witches' prophecies ultimately lead to his downfall.