Some say that because the United States was wrong before, it cannot possibly be right now, or has not the right to be right. (The British Empire sent a fleet to Africa and the Caribbean to maintain the slave trade while the very same empire later sent another fleet to enforce abolition. I would not have opposed the second policy because of my objections to the first; rather it seems to me that the second policy was morally necessitated by its predecessor.)

- Christopher Hitchens