George W. Bush's abrogation of the Anti-Ballistic Missile Treaty on December 13 was a reckless act taken without regard for the consequences--it has dealt a severe blow to the idea of a world order grounded in collective security. Bush justified this act of hubristic contempt for the rest of the world as a measure to protect the American "homeland," but it actually will increase the danger of nuclear war and place this country at greater risk.