The philosophical viewpoints The Plague deals with are the absurd, existentialism, and humanism. Yes, that’s a lot of philosophies, and the novel combines various elements of each: the absurdist tenet that the world is irrational and without meaning; the existentialist principle that the world is indifferent to the horrors of human suffering; and the humanist belief that man is good and worth fighting for. Throw in a few discussions of abstraction and some jabs at religion or even plain old spirituality and you’re looking at one hell of a philosophical melting pot. Yummy.
The abstract nature of mass death makes it possible for people in this story to survive the plague.
The Plague contains more elements of humanism than it does of any other philosophy.
The Plague contains too many internal criticisms of the philosophy for it to be labeled a humanist work.