An additional quotation that shows what people think about Boo Radley comes from Scout's reference to what Stephanie Crawford, the town gossip, has said about him. According to her,
Boo was sitting in the living room cutting some items from The Maycomb Tribune to paste in his scrapbook. His father entered the room. As Mr. Radley passed by, Boo drove the scissors into his parent's leg, pulled them out, wiped them on his pants, and resumed his activities. (p.15)
This is pretty much the standard picture of Boo Radley in Maycomb. Just about everyone in town regards him as some kind of monster, a scary boogie-man who belongs in an institution. But according to Miss Stephanie, Mr. Radley insisted that no Radley was ever going to any asylum.
Scout, Jem, and Dill decide to play the "Boo Radley Game," in which the children act out imagined scenes from Boo's home life. In one such game, they imagine that Mrs. Radley had been beautiful until she married Boo's father. As well as losing most of her teeth and hair, she also lost her right forefinger. Apparently, this is because
Boo bit it off one night when he couldn't find any cats and squirrels to eat. (p.44)
During the trial of Tom Robinson, when Mayella Ewell takes the witness stand, Scout observes that
she must have been the loneliest person in the world. She was even lonelier than Boo Radley, who had not been out of the house in twenty-five years. (p.196)
As this comment clearly indicates, Boo Radley is not just regarded by the people of Maycomb as mad, evil, and dangerous to know, but also the epitome of loneliness. The idea that Boo Radley may have perfectly good reasons for not venturing outside his home in a quarter of a century never seems to occur to them. They simply imagine Boo cooped up inside that house for all those years and automatically make the assumption that he's lonely.
Once again, we see here an example of someone making a judgment about Boo without really knowing him or anything about his life.