In what world is Banksy supposed to be subtle?

Did you look at his artwork of a judge hitting a protestor with a gavel while the protestor was bleeding on the ground and think “huh, I wonder what this means” (https://www.bbc.co.uk/news/articles/cm2z30p033ro).

By those standards a man wrapped in the flag walking off the edge is the height of subtlety. I guarantee you this - none of the people it should be offending will realise he’s talking about them.