The genocide doctrine employed by modern administrations has nothing to do with the Holocaust either, it has a great deal to do with dressing up the wars that our leaders decided they wanted to fight anyway.
Whether or not Ron Paul actually said that he would not intervene to stop the Holocaust, there is nothing particularly extraordinary about this position. The United States has never intervened to stop a genocide. Not in WW2 and not since when several genocides have taken place, most notably in Africa, without any military intervention.