Choose a current controversy related to diversity and persuade your reader on the topic. You will accomplish this by using fact and logic, as befits your academic audience. Steer clear of arguments based on emotion or morality. Your job is not to be the cheerleader for people who already agree with you or share your morality, and only logic will sway your opponent.
You want to illustrate that you have considered both sides of the issue; an effective way to persuade your reader is to show that you have thought through the controversy yet maintain your point of view. Dedicate a paragraph to your opponent’s strongest argument; by offering a rebuttal or ceding the point (and then proving that your cumulative points are stronger), you will win credibility.