General Zaroff makes several statements that show he is evil. During his discussion with Rainsford over drinks, Zaroff excitedly talks about the animal he hunts, emphasizing that this animal reasons. When Rainsford states that is no animal that can reason Zaroff says, "Dear fellow,...there is one that can." Rainsford finally understands Zaroff is referring to hunting humans.
Zaroff goes on to justify hunting humans by telling Rainsford he hunts "the scum of the earth: sailors from tramp ships--lassars, blacks, Chinese, whites, mongrels..." What makes this statement worse is his belief that these people are less important than Clearly, General Zaroff has no remorse for killing human beings for the sake of "sport." He then goes on to say "a thoroughbred horse or hound is worth more than a score of them."
When Rainsford asks how Zaroff finds his victims in such a remote location, Zaroff points out to some beacons in the water. "They indicate a channel," he said, "where there's none; giant rocks with razor edges crouch like a sea monster with wide-open jaws. They can crush a ship as easily as I crush this nut." This admission that Zaroff not only hunts humans, but he also ensnares them clearly shows his evil nature.