Why the United Nations?

The Hoover Institution's Kenneth Anderson writes about the United Nations and why it continues to exist, for Hoover's Defining Ideas journal:

The distinctive salience of the United Nations is that it is a failure today—and a hope for tomorrow. And this is so even though it is always a failure today, each and every day—and yet always a hope for tomorrow.

I think Anderson leaves out one key reason for the U.N.'s existence: it provides employment for thousands of diplomats. This gives them much reason to support its continuation.