Answer: they are both really good actors
There can be a variety of messages-- typically a book will speak differently to each reader because each reader has different life experiences, and different ideas/morals.
For me personally: It had a very huge anti-imperialist theme. It criticized the British imperialist <span>escapades </span>abroad, and it tried to exhibit that what Martians do has little difference compared to what the British Empire had done.
Death of a Salesman is an incredibly complex drama, and it's value is more in the context and subtext than the story itself.