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With regard to the statement that it is all about oil, you should tell them that accepting that as being true, isn't it still a good thing to be getting rid of Hussein. With regard to the second argument, you should ask them if their position is that they don't object to removing dictators from power, they just don't want to make a habit out of it. If that is their position, you might suggest that they wait until we move against a second or third dictator before raising objections. You might also inform them that if they want to make it more difficult for the United States to help other countries become free, they might consider making campaign donations to people like Hussein, Kim Jong Il, Assad, etc.