Having established a plan with Roderigo to provoke Cassio into a fight, Iago is once again left alone and delivers another soliloquy about his evil scheme. He has proclaimed that winning Desdemona for himself would be the best possible form of revenge against Othello, but that he will settle for driving Othello mad with jealousy by tricking him into thinking Desdemona has been unfaithful. Iago finishes his speech with the alarming boast that he will make Othello "thank me, love me, and reward me" for making a fool out of him, again using the racist imagery by saying he will turn Othello into an ass (donkey).
Institutionalized oppression is not only experienced by people of racial minorities, but also affects those of the LGBT community. Oppression of the LGBT community in the United States dates back to President Eisenhower’s presidency where he passed the Executive Order No. 10450 in April 1953 which permitted non-binary sexual behaviors to be investigated by federal security programs.  As a response to this order, “More than 800 federal employees resigned or were terminated in the two years following because their files linked them in some way with homosexuality”. 
This is perhaps one of Shakespeare's more interesting plays, if you will. In comparison to Macbeth it isn't quite the walk in the park.
I think conceptually it enables the reader to see that characters can influence characters to such a degree that the original traits are masked and changed. Tragedy in this play is definitely a main component - and a great emphasis that perhaps the villain doesn't always find their true defeat. In a way, wasn't the "villain" successful? He lied to everyone and pretty much killed whomever got in his way.