Why, according to wilson does judge driscoll not listen to his story regarding luigi?

Wilson went back to his principal and reported the failure of his mission. Luigi was incensed, and asked how it could be that the old gentleman, who was by no means dull-witted, held his trifling nephew's evidence in inferences to be of more value than Wilson's. But Wilson laughed, and said:

"That is quite simple; that is easily explicable. I am not his doll—his baby—his infatuation: his nature is. The judge and his late wife never had any children. The judge and his wife were past middle age when this treasure fell into their lap. One must make allowances for a parental instinct that has been starving for twenty-five or thirty years. It is famished, it is crazed with hunger by that time, and will be entirely satisfied with anything that comes handy; its taste is atrophied, it can't tell mud cat from shad. A devil born to a young couple is measurably recognizable by them as a devil before long, but a devil adopted by an old couple is an angel to them, and remains so, through thick and thin. Tom is this old man's angel; he is infatuated with him. Tom can persuade him into things which other people can't—not all things; I don't mean that, but a good many—particularly one class of things: the things that create or abolish personal partialities or prejudices in the old man's mind. The old man liked both of you. Tom conceived a hatred for you. That was enough; it turned the old man around at once. The oldest and strongest friendship must go to the ground when one of these late-adopted darlings throws a brick at it."