He's so good at being bad that we can't help but kinda admiring the guy. Contrary to popular belief, Iago isn't some evil mastermind that plans the deaths of Othello and Desdemona. In reality, he's just guy who gets trapped by his lies.
  1. He must have been genuine at one point in his life.
    After all, why live your whole life pretending to be someone you're not? It's not plausible that he faked his entire way through the ranks. Remember, he was known as Honest Iago. To be recognized as such, he would have to build his reputation very meticulously over a long time.
  2. His anger at Othello is understandable.
    Iago time and time again proves his skills on the battlefield yet Othello does not give him job promotion. Instead, Othello promotes Cassio, a nice but inexperienced soldier. C'mon, Othello!
  3. Iago hears rumors of Othello sleeping with Iago's wife.
    First the promotion, and now his wife is cheating on him with Othello?! Poor guy. Even though Iago senses the rumors are not true, he's looking for a reason to get back at Othello.
  4. Evil people do not need justification.
    Evil people just do it. If Iago was truly evil, he would not have looked for reasons to get revenge. By doing so, Iago shows that he has a sense of morals and ethic. He recognizes he can't kill Othello without reason.
  5. He only intended to pay back Othello equally for the pain that he received.
    Iago's goal was simply to make Othello feel like he lost job and a dutiful wife. Iago didn't plan on causing people die.
  6. His whole plan depended on a handkerchief accidentally falling.
    If Iago didn't obtain solid "proof" of Desdemona's infidelity, then Othello never would have his mindset on killing Her. Iago got lucky. So damn lucky. The handkerchief was dropped at the right time and place with the right person around. No evil genius would attempt such a foolish plan with many loopholes.
  7. Distraught by Desdemona's state
    Throughout the acts, Iago is verbose and witty. Yet, when he meets Desdemona in Act 4, his lines are significantly shorter. This can be interpreted as being silenced when he comes to the realization that Desdemona did not deserve to be a victim. He feels guilt, which evil people do not feel.