How does Othello's position in a mostly white society mean his fall from grace is more tragic in Othello?

The white European world (of Shakespeare's England and Othello's Venice) was victim of two great fears: Christianity being overrun by Islam; black men seducing their white women.  Both are front and center in Othello, man and play.

Othello is a stranger in a white world.  He is black.  He is a former Muslim who converted to Christianity.  He is a former slave who is converting to white civilization.  He is a military man trying to convert to civilian life.  He is an old bachelor who is trying to finally marry.  He is Brabantio's age, marrying a white woman half his age.  Needless to say, he is a threat to the establish white society (represented by Brabantio and Iago).

What's more, Othello buys in to the white "color code."  He wants to be white, like Cassio.  That's why he's so jealous of him.  He wants a white woman; she's a trophy wife, a status symbol that shows he's made it in white society.

Remember, the play was staged in 1600, the beginning of the slave trade.  It is the first play to have a "bedroom scene."  That the consummation of the scene is theros (death) instead of eros (love) foreshadows the tragedy of black slaves for the next four hundred years.