WHAT MESSAGE IS CONEYED THROUGH THE …

The various messages conveyed by the story are:
(1) World is full of distractions i.e. is a rattrap and one who gets distracted, gets caught in the rattrap.
(2) The light of kindness can remove the darkness of cruelty and negativity

The theme of the story is that most human beings are prone to fall into the trap of material benefit. However, every human being has an essential goodness that can be awakened through understanding and love. A human being has the tendency to redeem himself from dishonest ways.
The theme is developed with the help of the metaphor of the rattrap. The peddler of rattraps calls the world a big rattrap. The material benefits like riches and joys, shelter and food, heat and clothing are temptations that that allure a person to fall into the rattrap of the world exactly as the bait of cheese and pork attract a rat to fall into the rattrap. Once someone takes the bait, the world closes in on him and then everything is lost.
The peddler is tempted by the thirty kronors of the old crofter. He steals the money. Now he is afraid of being caught and moves through the woods. It is the kind, sympathetic, loving and generous treatment given by Edla Willmansson that helps him get himself free from the rattrap of the world.