Can someone explain the meaning? "Truth, justice, and the american way" is not enough any more because a protester and a policeman exchanged a rose in a gestur

Can someone explain the meaning? "Truth, justice, and the american way" is not enough any more because a protester and a policeman exchanged a rose in a gesture of peace? I'm kind of confused by this. I can't tell if Superman is a metaphor, or if he's just Superman. Is this the author's way of saying, "Superman belongs to the world, not just the US," or is the message bigger? Something more like, "We are all citizens of the world, so it's time to abandon ideas like 'the American way'." I'm asking genuinely. I've always had a hard time reading in to the subtext of literature (yes, I count comics as literature), and there aren't a lot of people in my life who would read a Superman comic and help me dissect it from a literary standpoint.