What human trait does shirley jackson criticize in the story

Shirley Jackson wrote the book "The Lottery". In her book, she criticizes the following human trait:
Human nature is inherently violent. The need to follow the crowd and fit in is linked to this. It is why the lottery was allowed to continue even though it was violent and cruel. The realist theory states that humans are inherently selfish and violent. Mob justice prevails when the mob decides one of the characters in the story, Mrs. Hutchinson is guilty of a crime. Probably the most disturbing part of the story is that the mob enjoys stoning one of their own community. 

So far i know that you cant