Diversity: Strength or Weakness?

I found an interesting article, Can Diversity Destroy Us? by Pat Buchanan. In it, Buchanan theorizes that there is an ongoing "deconstruction of America", and places some of the blame on the diversity of its people. He disagrees with those leaders who constantly point out that America's strength is its diversity.

I must say I agree with Buchanan.

Diversity is a good thing when there is a common purpose, but the whole "melting pot" thing isn't working. It doesn't work when the "ingredients" in the pot don't "melt" together. It's not working because many in America demand this and that for their own selfish purposes rather than the purpose of the country, which is totally lost in the confusion. How could a baker make a cake if the ingredients all did their own thing and the eggs didn't blend with each other let alone the vanilla? And the flour refused to blend with the sugars? The "melting pot" only works when there is a common goal and "melting" happens to blend into that one purpose, that one common goal.

America doesn't even have an official language. Americans no longer worship the One True God, but many gods. I think Buchanan has a point...how can we be a strong nation when our residents speak different languages, have cultures that practice different "laws", and worship different gods?

America doesn't have one vision, we don't have one purpose. There is no strength in that.

Buchanan uses some excellent examples of countries and governments that have failed and cites diversity as a major cause in those failures.

I find it a scary prospect that a nation can lose its identity. Nations fall when they lose their identity, lose their sovereignty, and are not unified in purpose.

We can be a diverse people, but we must be unified in purpose.

*edited for grammatical errors as per Arron's correction.