Macbeth isn't the real murderer.

I have a question. Who's really to blame for Duncan's death? It's a question that's hard to answer, to be honest. First, you have Macbeth. Macbeth is the man who physically followed a ghostly knife to Duncan, taking his life in his sleep in the most underhanded and dishonorable way possible. However, was he really to blame? There are so many factors as to why he killed Duncan, but none of them were truly because of him. Yes, he wanted to kill Duncan for the throne, because if you recall, he had the thought to kill Duncan soon after he was told that he could be the king of Scotland. However, Macbeth was afraid of murdering Duncan! If not for his wife, actually, he likely wouldn't have even gone through with it. Now, let's move on to the real murderer that we should be talking about, rather than a coward like Macbeth.

Lady Macbeth is a very deceptive and intelligent character, and though she wasn't the one to physically murder Duncan, she was the brains behind it all. She urged Macbeth into doing the deed each time Macbeth was uncertain of what he was doing. She made the plan to kill the king in his sleep. She rang the bell to give Macbeth the cue. She framed the guards when Macbeth was shaken from guilt following the murder. All of this points to the fact that Macbeth technically did not kill Duncan at all - instead, it was Lady Macbeth who killed Duncan. If Lady Macbeth did not exist in the first place, Duncan would likely never have died. After all, Macbeth questioned his own motives not once, but twice before he killed Duncan. He knew what he was doing was wrong, and if he had followed his own conscience and made his own decisions for himself, Duncan would probably not have died. Dang you, Lady Macbeth! You broke Macbeth. It's all your fault.