You are responsible for the behaviour of your own country and that is something you can impact. So, let's have a chant against Starmer.
That's very roughly from the 1988 Massey Lectures given by Chomsky in Canada where he was chewing on some Canadian journalists. The lectures were later turned into the book, "Necessary Illusions, Thought Control in Democratic Societies".
Which begs the question why is today's Stop The War march going to the US Embassy rather than Parliament Square?