"Blinded by nationalism" I don't know, seems like a clear concise message that has relevance in today's world.
How do you know it's "blinded by nationalism"? There are plenty of non-national flags which are just as blinding
Is it though? This can mean anything. Is waving a Palestinian flag the same as waving an Israeli flag? Where do we draw the line between harmful and productive nationalism? Who exactly is blinded by nationalism?
It is vague enough to appear deep to those trying to find something deep but not concrete enough to appear as anything that will stick in people's minds for more than a week. Unfortunately a lot of modern art is like this.
Why nationalism? A flag can represent more than a nation. Can be blinded by any "flag" / ideology.