Macbeth - who

Macbeth Ultimately everyone is responsible for their own actions, however, there may be certain factors that affect one's decisions or actions. Macbeth was influenced by numerous characters who contributed, directly or indirectly, to his downfall. Lady Macbeth persuaded Macbeth to kill Duncan by making him feel like a coward and guilty, Banquo made Macbeth afraid and jealous, and the witches elevated Macbeth's confidence, making him arrogant and greedy. All these characters contributed in one way …

…which was the first act that would ultimately lead to his ruin, Banquo, through no fault of his own, caused Macbeth to be fearful and envious, even further pushing him into his own decline, and the witches, through their powerful words, made Macbeth believe that he was indestructible, which also aided in his downfall. While no one can force a person to do anything, they can still play an important role in influencing one's decisions.