In to kill a mockingbird the character Boo Radly is made out to be some awful, scary, dangerous man. Scout and the others believe the rumors and lies they have been told about him causing them to fear him. The difference between the fear they have of Boo and the fear they have of Bob Ewell is that they don't actually fear Boo. It's more of a fake fear, They fear what they have been told, then being actually terrified as they where when Bob Ewell attacked.