Here's why:
* The lottery is a tradition, not a fair process: The villagers follow the lottery blindly, accepting it as a necessary tradition, even though it's cruel and unjustified. The method of selecting the victim is purely random, based on the drawing of slips of paper from a black box.
* Tessie's name is drawn, making her the unfortunate victim: There is no logical reason for Tessie to be chosen over anyone else in the village. Her fate is entirely determined by chance.
* The story highlights the dangers of blind adherence to tradition: The lottery symbolizes the dangers of following traditions without questioning their morality. It highlights how even in a seemingly normal and peaceful community, barbarity and injustice can thrive.
It's important to note that the story doesn't provide a specific reason why Tessie is chosen. The author intentionally uses the random lottery process to create a sense of suspense and shock, emphasizing the absurdity and cruelty of the tradition.