Based on the excerpt, what is the meaning of the word inscrutable?

You have been given an assignment to speak on the federal prison system in the u. s. which of the following sources is likely to be the least credible? a. an interview with an inmate of a federal prison b. the us department of justice “federal bureau of prisons” website: c. the website [] which discusses the danger of releasing an alarming number of convicts back into society d. an article from foxnews. com about the florida state penitentiary

The overwhelming majority of the peoples and nations of the world today want to live in peace

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?