Further to what? Further to murdering Banquo? Further to revisiting the witches? Further to killing Macduff's family? Further to locking himself in Dunsinane castle? These are all actions he took as a result of his fears. At any point, one supposes, he had other options.
Banquo is suspicious of Macbeth's actions and the witches' prophecies, believing that Macbeth may have achieved his newfound power through foul means. Banquo also fears for his own safety and the safety of his descendants, as he knows that Macbeth is ruthless and willing to do anything to maintain his position.
Act 5, scene 5. Just after Macbeth finds out Burnam wood is moving.
By playing on audiences fears
Suspense
Macbeth says he fears Banquo's wisdom the most because it poses a threat to his plans. He worries that Banquo's intelligence and insight may uncover his own misdeeds and ambitions.
The witches had predicted that Banquo's descendants would become kings whereas Macbeth's would not. Macbeth resented that. Also, Banquo was aware of what the witches had said and might suspect Macbeth of Duncan's murder. Macbeth says, "My fears in Banquo stick deep."
Malcolm is primarily worried about the possibility of losing his power and status, especially in the face of Macbeth's rising ambition and tyranny. He fears that Macbeth's ruthless actions will lead to greater chaos and destruction in Scotland. Additionally, Malcolm is concerned about the potential betrayal from those around him, making him wary of alliances and the loyalty of his supporters.
yes fear can cause depression and effect the brains actions
Lady MacDuff and her children are killed in Act 4 of "Macbeth". Macbeth hires assassins to kill the MacDuff family because he fears MacDuff is plotting against him..
Macbeth was hiding a lot. He was hiding his fears and guilty feelings. He also was hiding what he was doing with Scotland and the why everyone was dieing from Lady Macbeth
I'm guessing that you are asking two questions: "How does Malcolm feel about Macbeth?" and "What has Macbeth done to become the king?" The answer to the second question is simple: Macbeth killed King Duncan in order to become king. The answer to the first question is almost as simple: Malcolm hates and fears Macbeth. I hope your command of English is sufficient to understand this answer.
On the battlefield, Macbeth at last encounters Macduff. They fight, and when Macbeth insists that he is invincible because of the witches' prophecy, Macduff tells Macbeth that he was not of woman born, but rather from his mother's womb / Untimely ripped (5.10.15-16). Macbeth suddenly fears for his life.