The kids Scout and jem assume that he is a killer who stabbed his father. ¨As Mr. Radley passed by, boo drove the scissors into his parents leg, pulled them out, wiped them on his pants, and resumed his activities¨. (Lee pg. 11)
Mean while he might be a nice person who had just been so introverted that he just stays inside all day 24/7 and jut happens to be the most rumored becuase poeple say that they ¨saw¨ him.
My opinion is that he is a really nice person who just doesnt talk much and is to old to do anything or hurt and that his place is really clean but feels like he doesnt want to go out side becuase people will judge and threaten him.