alt Hacker NewsStrong disagree. First, like many of the other comments mention, Banksy is known for being clever and witty, but not particularly subtle.
But more to the point, while you may think the meaning is a bit obvious, the fact that the flag is unadorned (which/whose flag is it?), and the man is unknown, makes me think this statue could be the ultimate Rorschach test. I'm sure there are tons of people thinking "Ha ha, this is the perfect commentary on all those idiot <people on the other side who I disagree with> wrapping themselves up in their ideology of <patriotism/social justice/cause du jour> as they march <some particular country/society/the world at large off a cliff>".
In other words, I'm guessing you probably felt the meaning was "obvious" because you filled in the blanks in the above madlibs-style statement in a way that feels obvious to you, and I think folks on "the other side" would probably fill in the blanks with the exact opposite notions in a way that feels "obvious" to them.
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I'm guessing most would assume this is about nationalists, and I don't think even the nationalists would imagine Banksy is on their side?
> the fact that the flag is unadorned (which/whose flag is it?), and the man is unknown, makes me think this statue could be the ultimate Rorschach test
This is part of what's obvious. The whole thing, including this oooh aahh Rorschach part, is obvious. It's thoughts that we all had in high school, and it is hack.
The flag is unadorned and I think you can extend your interpretation to include the proliferation of flags which have a minimal "history".
Banksy is from Bris'l which is sort of north Somerset (Somerset keeps on morphing faster than a sci-fi shapeshifter).
Cornwall has had a white cross on a black flag since 18something. Devon decided to adopt a black edged white cross on a green flag. I remember seeing Devon flag car stickers in the '80s - its a little older than that. Somerset now has ... a flag. Yellow and red I think.
No idea why because people can't decide what it is! The land itself knows exactly what and where it is but the political boundaries ebb and flow with the phases of the moon. Is Avon included ... what is Avon? Ooh, BANES - Somerset? Not today thank you. It goes on. Anyway, do Devon and Somerset and co really need a flag? No of course not.
What we really need is a Wessex flag, which will take over Mercia ... and a few other regional efforts ... and end up as a red cross on a white background. Then we could munge that with a couple of other flags and confuse the entire world with something called the Union Flag.
Then we can really get complicated ... hi Hawaii!
The ambiguity - that this could apply to anyone, that people are so caught up in their belief of choice - is part of the obviousness, at least to me. I would expect more people to be aware of this, than to actually believe that it's talking about, say, Americans in particular.