What arguments did the young girl give in favour of the strangers staying there?

Hint: A peddler is the protagonist of the Rattrap narrative. He has a negative outlook on life. The peddler wasn't always like the way, and he was once a nice guy. He now needs to rely on selling rat traps, begging, and even stealing to make ends meet due to tragedy.

Complete answer:
The peddler sees the world as a huge rat trap. He claims that the world offers us materialistic items to tempt us, much like the cheese we use to entice mice. As a result, falling for these lies traps us and causes us to lose everything. In this story, a young generous woman takes in the rattrap merchant. As a result of her generosity and kindness, his gloomy attitude on life improves. This story teaches us about the basic human goodness that we all require.

To favour the stranger's stay, the girl claimed that the stranger walked about the entire year. He was most likely not welcomed or made to feel at ease in any of the places he visited. Everywhere he went, he was pursued. He was always terrified of being apprehended and interrogated. She wished for him to spend one day of calm with them throughout the year.

Note: The basic moral of the story is that most individuals are prone to falling prey to monetary gain. On the other hand, every human being has innate goodness that can be awakened through understanding and love. Humans have a natural impulse to make amends for their mistakes.