I am increasingly skeptical of the Liberalist school of international studies. Democracy is not an absolute: its nature is altered by the cultural, economic, geographic, historical, and theistic framework of a place or group. Put bluntly, democracy changes the structure of a state, but not the nature of the nation that lies beneath.
I’m not sure what you mean by “Liberalist school”. I’m quite sure it’s not wise to try to force a form of government on another country, which seemed to be what Bush was trying to do. Whatever shape democracy takes will be determined by culture, as you say.