The magistrate calls Meursault “Monsieur Antichrist” because: Meursault does not believe in God The Stranger's theme is more of Nihilism. It is a philosophical belief that "nothing matters" or has significance. It denies the existence of God or of meaning in life.
I believe the correct sentence should be; “Why do you think the visitors didn’t obey the rules?” Mother asked. A question mark is needed for the question and Mother must be capitalized.