We have a better chance of making it work than of reforming everybody, everywhere. Patriotism is not presently a popular idea. Driven too far, it can indeed become jingoism. Its savage cousin, ethnic bloodshed, is riding high in much of the world. We don't need more of that.
Patriotism is, however, a different concept and a powerful emotion.
It has been prematurely counted out. Before Marx changed our perceptions and redivided humankind by economic class, Western historians wrote in terms of nations as the natural social unit. Marx overstated his case. At the advent of World War I, many German Socialists could not believe that workers from different nations could be herded into armies to shoot at each other. They were wrong.