Nationalists are the elite's useful idiots.
You got that wrong. Globalists are the elite's useful idiots. How else could they undermine national labor and environmental laws by opening up free trade with nations that fall far below our standards, without the help of the useful globalist cheerleader idiots here at home?
Marx had it backwards. He thought the proletariat would unite across borders and defeat bourgeois nationalism. Ultimately, it was the bourgeoisie who united across borders and are now running up against proletarian nationalism.