The purpose of this essay is to investigate the characters’ destructive thinking and actions in Macbeth, Richard III, and Othello. The specific characters focused on are Macbeth and Lady Macbeth, Richard the III, Iago and Othello. Certain elements of Immanuel Kant’s theories on what makes an action constructive and good, for example the Categorical Imperative, are employed to give further insight in to how the characters’ destructive nature is shown in the plays. Using texts by Kant and about Kant’s works, the essay also aims to point out how the characters fail in thinking and acting constructively, unintentionally or intentionally. Another device used to map the destructive nature of the character is the concept of sophistry In addition, the texts suggests that specifically the more victim-like character of Othello is even more similar to the obvious antagonist Iago.