In The Most Dangerous Game, how is the conflict man vs man sharply differentiated good and evil?

By definition, man v. man involves two human beings as opposed
to man v. himself or man v. nature.  For example, a man's struggle with his own feelings would
constitue man v. himself, a man's struggle with a jaguar or tornado would illustrate man v.
nature, and a mental or physical struggle such as that between Rainsford and General Zaroff in
The Most Dangerous Game is man v. man.

Man himself contains both
good and evil.  Man is neither purely good nor purely evil.  Therefore a true, pure battle of
good and evil cannot exist within the conflict of man v. man.  However, one man may be clearly
morally superior to the other, and the reader considers him "good" while the other "evil," but
this is subjective.  Most readers will agree that General Zaroff is "evil" and morally corrupt as
he hunts humans for sport.  Rainsford is likeable and the character we feel the need to cheer
for, making him "good"--if only by default.