If this message is unclear to you, Mendes has done his job well. He meant to confuse the message, and, as I say, deliver it subliminally. The sort of "message" you claim is there can not be conveyed "subliminally", one has to cognitively accept it, as you obviously have. Based upon your claim, my views have been changed by this movie, and I do not even know it. LOL!!
You're obviously wrong. The message is subliminal. We can't see it. Some of the folks here are privy to the message because they have special insight. The rest of us must rely on their reviews to know what is really going on. : )