Angelus is the classic pathological sadist. In some way, all creatures need love, but the sadist is incapable of loving or being loved. The reason why he is so slow, even unwilling, to kill in non-sustenance situations, is because death releases his victim from his control. His desire for control was evident during the unholy triumvirate where he delighted in displays of Drusilla's affection, largely because it infuriated Spike , the opposing dominant male. It established his power over Spike by being able to evoke such strong emotion so easily from him.
Deception is more a tool of evil than a kind of evil.
This implies that no human in the Buffyverse is totally evil. However, some humans have hurt others without any apparent remorse. Greed and selfishness are weaknesses that often make humans in the Buffyverse susceptible to corruption and collaboration with the forces of evil. The Shroud of Rahmon thieves . Tom and Richard the Frat boys , the Mayor , Faith , Ethan Rayne , the gun-club guys , Wolfram and Hart , Magnus Bryce , the parole officer , Ben .