How does irish immigration to america connect to the novel the orphan train

Which type of story uses animals as characters in order to illustrate a general truth about human nature?

Plsss don’t worry about the green strip can someone plssssss

London includes a quote about john thornton as he is observing hal attempt to motivate the exhausted dogs "it was idle, he knew, to get between a fool and his folly". if the word "idle" is defined as "of no real worth, importance, or significance", what does this statement mean with regard to hal? who is the fool? what is hal's folly? why would john thornton think it of no real worth or useless to intervene?