Paul F. deLespinasse, PhD, Professor Emeritus of Political Science at Adrian College in Michigan, in a May 15, 2003 article titled "Illegal Aliens and the War On Terrorism," available at the Common Dreams website, wrote:

“Since September 11, 2001, the usual (and fallacious) arguments against free immigration—that it causes unemployment, burdens taxpayers, and undermines American culture—have been augmented by fears that terrorists will come into the U.S. illegally. But the scoundrels who took out the World Trade Center, the Pentagon, and four planeloads of travelers came into the U.S. legally.

And having a good mix of people born in all parts of the world, of all religious faiths and cultures, living in the United States can be an excellent defense against terrorist attacks. In a diverse, multicultural U.S., such attacks are bound to kill many people with whom the terrorists feel an affinity.”

May 15, 2003