[Once-Ler]

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

The America First movement was an isolationalist group that opposed United States involvement in World War II. Many prominent Americans were members, including aviator Charles Lindbergh. At its peak, America First had 800,000 members.

[raybbr]

...the AFC advocated four basic principles:

1. The United States must build an impregnable defense for America.

2. No foreign power, nor group of powers, can successfully attack a prepared America.

3. American democracy can be preserved only by keeping out of the European war.

4. "Aid short of war" weakens national defense at home and threatens to involve America in war abroad.

Number 3 has no bearing on today's topic. As for the other 3 - they are not desirable because....?