There are two big tragedies in life, one is living in a world where everybody lies, and the other, even worse, is living in a world where everybody says the truth.
I guess this is the message of the movie.
In a world where everybody is honest, the one who is not, becomes a hero and a quite successful guy.
This couldn’t of course happen in everyday, contemporary world, but "For what is Truth?
In matters of religion, it is simply the opinion that has survived.
In matters of science, it is the ultimate sensation. In matters of
art, it is one's last mood."
And it is also a way of denying reality.
Aren’t dreams much better?