Note that this reasoning is grounded firmly in our fundamental mission. Tracing the justification back to fundamentals is very important. The arguments above are only a bare sketch of what they might be. You will have to fill in the details yourself. You might examine whether the particular arguments apply to your own university and your own department, and if so for which types of diversity.
Many departments already enjoy the benefits of a significant number of faculty of Asian descent.
Many also have a faculty with diverse national origins and cultural backgrounds. At least one university has announced a program to increase the number of gay faculty members. In general the needs that are most frequently perceived are for women faculty, Black faculty, and Hispanic faculty. The arguments above would seem to apply to these groups, at least at most universities. It is true that the details of the argument presented above, and the priority of applying them to specific groups, may differ from one department to another.