"All that is necessary for the triumph of evil is for good men to do nothing."
or
"All that is needed for evil to triumph is that good men do nothing."

Edmund Burke

But I would not go so far as to say that the Iraq invasion was "evil," as you seem to imply. By extension, that would make our soldiers -- our all-volunteer miltary men and women who sweat for us, bleed for us, and die for us in Iraq -- evil-doers. And I really don't think you want to go there.

Barbara (mother of a former U.S. Army captain who served in the Gulf War)