Has Shakespeare created a character that thinks and acts like any other human being with destructive traits who is driven by his negative thoughts and behaviors which we all possess as members of the human race?

Is Iago a devil incarnate or simply a malevolent man? In other words, has Shakespeare created a character not unlike the Sphinx in Oedipus the King, meddling with the lives of mortals as a negative force in the cosmos? Or has Shakespeare created a character that thinks and acts like any other human being with destructive traits who is driven by his negative thoughts and behaviors which we all possess as members of the human race? Provide proof, that is, dialogue, from the play to support your argument.