Since you seem intent on furthering this conversation, here's an honest suggestion for you if you want to truly think about what you are arguing. Extensive academic thought already exists related to the argument you are trying to make -- in short, that it is worth restricting diversity in order to normalize cultures across the globe:

http://en.wikipedia.org/wiki/Postcolonialism

Postcolonialism, and especially postmodernism, are very complex concepts that require a great deal of study to grasp, but it may be worth your while if you want a serious challenge to your argument.