Social diversity is a good thing??

I think that the sentence “social diversity is a good thing” is not any problem. Also it’s true that some people create conflicts because people don’t know others people’s cultures and customs. But although this I have said, I think it is a sentence that makes people interested in others people’s ethnics, cultures, religions, gastronomy, music, art, ...
Some things we could do for changing it could be:
- Make some people to know the others cultures, to pretend to avoid problems.
- Make some advertisements to stop radical people.