In your opinion which of the two was the dominant factor in Othello's Downfall: His foolishness? OR Iago's villainous nature?

In my opinion, it was Otherllo's foolishness and jealousy that were responsible for his downfall. Othello was a brilliant soldier, thus we know he was capable of rational thought. Unfortunately, he allowed his quick temper and emotions to drive his actions.... something that led him to murder his wife and kill himself. Iago was definitely guilty of using Othello's weaknesses against him..... a master manipulator, but Othello had the intelligence and strength of character to overcome Iago's manipulations and failed to do so.