Final answer:
Macbeth's choice to murder King Duncan leads to unforeseen consequences like psychological torment and public suspicion, ultimately causing his downfall and further violent actions.
Step-by-step explanation:
The unforeseen consequences following Macbeth's choices are rooted in his ambitious desire for power and the subsequent actions he takes to secure his position. After Macbeth chooses to murder King Duncan, he faces psychological torment and public suspicion, leading to further ruthless actions.
Each decision heaps upon him more trouble, as indicated in the lines: 'The multiplying villanies of nature Do swarm upon him' and 'But in these cases We still have judgment here; that we but teach Bloody instructions, which, being taught, return To plague the inventor: this even-handed justice Commends the ingredients of our poison'd chalice To our own lips.' These passages suggest that his violent means to secure his throne serve only to introduce new problems, such as guilt, fear of others' treachery mirroring his own, and ultimately his downfall.
For instance, Macbeth is haunted by Banquo's ghost and the guilt of his actions, revealing the immense stress and paranoia that come with his ill-gotten gains.