How does the story the summer of the beautiful white horse convey the message of honesty and integrity?

The story is all about honesty and integrity, but in an interesting way. The boys have been riding the stolen horse for months, but they never think of it as a permanent possession. They want the joy of riding, but know that they will eventually return the animal. The owner doesn't accuse anyone of the theft, even after seeing the boys with the horse. He only mentions that he would think the horse was his if he didn't know how honest their families were. The next day, his horse is returned. I think it shows a community that sincerely cares for each other, and that is willing to share and deal with temporary hardship while waiting for people to learn to do the right thing on their own.