Why does the town pf pokerflat decide torid itself of all improper persons?

The town of Poker Flat decides to rid itself of all improper persons to uphold community morals and maintain a sense of respectability. The townspeople believe that by expelling those they deem immoral, such as gamblers and women of ill repute, they can restore virtue and order to their society. This decision reflects their desire to create a more virtuous environment, but it ultimately leads to unforeseen consequences. The expulsion highlights the complexities of morality and judgment within the community.