What does decision to have banquo and his son murdered reveal about character?

The decision to have Banquo and his son murdered reveals Macbeth's descent into tyranny and the lengths he is willing to go to maintain his power. It shows that he is willing to commit any act, no matter how heinous, to protect his position as king. This decision also reveals Macbeth's growing paranoia and insecurity, as he sees Banquo as a potential threat to his throne. The fact that he is willing to kill Banquo's son as well shows a complete disregard for human life and a lack of any moral compass.