They're hindering their mental, emotional and spiritual growth. Expand your mind beyond the realm of mere contemplation and speculate the situation. It can't hurt to experience foreign cultures. When people consider diversity, they may think they would have to conform to the beliefs and ways of life of another culture, or lose their identities. The vital fact is to be open minded, to learn from others.
Diversity stems farther than skin color.
There is diversity of religion, personality, etc. Stony Brook is very diverse but everyone stays in their own clique. Rarely, will you see groups intermingle. I wish to see future events such as this one. It is possible for all ethnic groups to live in unity.