In 'Keepsakes and Treasures' how does the narrator's background explain the person he is today?

The narrator grew up in an orphanage, never having known his mother or father. His mother was placed into an insane asylum by her own grandfather, and was most likely raped there. The baby was given up, and later his mother killed herself. The narrator feels like he was robbed of a family and love. He gets revenge by killing the people who wronged him and his mother. At the orphanage, the deputy head sexually abused the children. The narrator takes revenge by killing him. The narrator has had an extremely unhappy childhood, and responds with violence because this is the only reaction he knows. When Mr. Alice finds him, he encourages this violent streak, making him his right hand man and assassin. He made sure the narrator was adopted and given a better life, as well as privileges such as a university education. He also provided the narrator with information about his family, allowing him to get revenge and closure. It is no wonder that the narrator feels extreme loyalty to Mr. Alice, who is the only person who ever tried to help him. The narrator feels little empathy for others as he was never shown any when he was young. He had to look after himself and turned to violence. This explains why he is a thug today. The narrator also seems to have adopted the same sexual preferences as the man who abused him. Although his background does not excuse his behavior, it does explain it.