(This question would do best in the Discussion Forum on eNotes.)
Arrogance is a mental and emotional state defined by a sense of distinction and separation. An arrogant person believes him or herself to be above others. This feeling can lead a person away from empathy and a sense that others have the same kind and quality of emotional experiences that he or she does.
When a person is separate and set apart, he may feel that his actions don't have a real impact on others because those others are not understood to be "like him".
Perhaps some arrogance can even lead people to believe that because they are set so high above others, they are not subject to the same moral rules that everyone else follows. They are allowed to act cruelly, without remorse or regret, because the normal rules of behavior do not apply to them.
It's important to note, however, that people who are arrogant one day may be humble the next. We have to allow people to change. Judging other people as if we ourselves are flawless can lead us to become the arrogant ones.