Finally! For links, you can find a ton of positive attributes of a diverse society by googling "diversity leads to", but to be more direct:
Being exposed to different cultures can cause conflict, but it can also cause reflection. In a truly diverse society, where diverse members of the society are treated as peers, people are accountable for the way they relate to members of the community who are not of the same group. Accountability is a powerful equalizer. The cases where "diversity" is represented as conflict, it's absolutely not the case that the non-dominant members are peers.
I would caution that it's inappropriate to treat as "diversity" a scenario where a dominant group is intermixed with a subject group for their exploitation. Otherwise, the Antebellum South of the US was among the most diverse societies in history. I don't think anyone would ever claim this.
There'd be no rape, robbery, or violence. People would keep to themselves like social shut-ins tend to do.
Sounds fantastic.
People attack each other, shout slurs and publicly express wishes of others' death. Slashdot is overflowing with hostility and it's barely possible to have a coherent discussion. I can't think of another corner of the Internet where people hurl "nigger" or "fag" at each other more. I can think of few places so quick to ignore arguments and resort to generalized attacks about any perceived identity. Don't take this the wrong way, but this is one of the worst places on the Internet.