This is a story where the division between the genders is of paramount importance. Key to focus on is the way that the kitchen is dismissed as being the zone of women alone, and therefore it is overlooked and ignored for not being important enough for the men to focus on as they search the house, looking for a motive for the crime. Note what Mr. Hale says about the kitchen when he is asked by the Attorney if he is sure that there would be no possible motive to be found in the kitchen:
"Nothing here but kitchen things," he said, with a little laugh for the insignificance of kitchen things.
This of course is the central problem with the men. Their treatment of the situation as being an important murder investigation is completely in contrast to the women and the way that they are horrified to be in this place and don't want to think about what has happened. Yet, ironically, it is their knowledge of the "trifles" of the kitchen that allows them to find the motive for the crime that the men are not able to locate, in spite of their serious demeanour.