Montressor is angry with fortunato because he feels that fortunato has insulted him. Earlier in the story montressor says "The thousand injuries of Fortunato I had borne as I best could; but when he ventured upon insult, I vowed revenge." We are never really shown what actually made Montessori think this but observing montressor himself he is easily insulted and narcissistic in a way. Montressor wants to keep his plan as secret as possible so he decides to use fortunato s best wine against him. Montressor tricks fortunato into thinking that he has something that could pass for the amontillado. Fortunato quickly gets excited and interested which is perfect for montressor s plan. Fortunato insist that he must try the amantilldo so they go to the montressor s vault where montressor kills fortunato at last.
Based on the article "Introduction to Modern Drama Study," the common issue that is addressed in feminist dramas is the effect a husband could have on his wife. Hope this answers your question.
I think that Sinclair's purpose for writing this piece was to show the reader the awful working conditions of the immigrants. He tries to awaken the reader to the terrible living conditions of immigrants moving in. Although this was Sinclair's intent the book actually ended up brining awareness to the ways the food was being produced.