Any form of writing, be it a story or a poem or a narrative, all have the central meaning or reason of why it is written. The written work will always have a moral or lesson that the reader can learn from.
When any author writes his book or story, his purpose is to deliver the main reason behind why that particular story is written. And when any reader can get the moral of the text, then he had successfully understood the author's intended purpose of writing that piece. So, in conclusion, the author's purpose can be said to be the main reason the story is written.
The 2 men are Nazi's and they want to take Rudy to a school to create an elite group. What did Rudy's sister call them? What do the dominoes symbolize? The dominoes symbolize the people in the Holocaust