In some ways she makes a very good point patriotism is often linked with nationalism and in the case of the Iraq war patriotism was linked with an excessive amount of nationalistic fervor. Propaganda laced songs from country artists and others I think contributed very much to the lack of discussion inside our own country regarding the war.
But propaganda laced songs ARE a form of discussion. And they are a great way for someone who feels passionately about something to get their message heard. The left has been doing it (quite successfully) since the hippie 60's.