Why does Atticus believe that Bob Ewell you act so cruelly?

Atticus believes that Bob Ewell acts cruelly due to his ignorance and prejudice. Atticus understands that Ewell comes from a background of poverty and lack of education, which may contribute to his behavior. Additionally, Ewell's desire for power and control over others, as well as his resentment towards those he perceives as superior, could also be factors in his cruelty.