Who but George Bush could use the news that Iran stopped its nuclear weapons program in 2003 as a reason to continue the same policy toward them, and see no reason to change anything because they may decide to make nuclear weapons in the future? Wouldn't it be prudent to talk? To find out if there are areas of mutual interest?
Bush's attitude is like that of a father who wants to punish a child for something he did wrong, and when he finds out he didn't do it, punishes him anyway because maybe he will do it sometime in the future. This is neither rational nor fair. Its not even like a grown-up.
