Is what happened to Miss Strangeworth justified?

In Shirley Jackson's "Possibility of Evil," Miss Strangeworth feels justified in sending the letters to the townspeople because she believes that it is her work to keep the town "clean and sweet." She views the town as "her town" and the people as "her people," so it is her duty to know everyone else's problems, whether real or imagined. It is also her duty to warn people of possible problems that may come their way.