The town in this story continues to hold the lottery only because it is what they have always done. These are a people who are terribly beholden to tradition, and they do not like change -- even change that seems small. The wooden box used in the proceedings is in poor shape, and the man who runs the lottery has suggested that they make a new box, "but no one liked to upset even as much tradition as was represented by the black box." In other words, if the thought of exchanging the old box for a new one is too much of a break from tradition for the people, there's no possible way that they could ever consider changing the tradition of holding the lottery itself.
Of course, one might imagine, each year, that there is one new objector: whichever person is chosen in the lottery. Initially, Tessie Hutchinson has no problem with it and comes from her home as relatively cheerful as the rest (considering what they are about to do). However, once she realizes that she will be the one to die, her tune changes. "'It isn't fair, it isn't right,' Mrs. Hutchinson screamed [...]." We might imagine that this is part of the tradition too: it seems only natural that the person chosen to die would suddenly find this lottery not to their liking. Only the victim rises above complacency. The story, then, really functions as an indictment of outdated traditions that benefit no one as well as the people who continue to uphold those traditions without critically examining their value (or lack thereof).