What is an effective inference-based question and two theme-based questions for "The Lottery" by Shirley Jackson?

Inference-based question: Why does the town in "The Lottery" continue the lottery from year to year?  Jackson never explicitly answers this question, but she certainly expects her readers to be able to answer it at her story's end.

Theme-based questions:

1. How does Jackson portray the roles of women in "The Lottery" and how do those roles connect to her theme of customs and tradition?

2. How does "The Lottery" portray violence, and what seems to be Jackson's tone toward violence and "victims"?