The root cause of troy becoming fenced off from other is

Past abuse and racial descrimination add to Troy's sense of isolation. Troy was raised by an abusive father and later jailed for robbery and murder. During the fifteen years he spent in jail, Troy became an accomplished baseball player. But after his release from jail Troy was too old to play in the newly-integrated major leagues. He is bitter and resentful at the opportunities lost because of the color of his skin Troy sees white America having a fence that keeps blacks contained, apart from the good life that whites enjoy. It is the fence that kept him from realizing his dreams and the fence that makes blacks garbage collectors while whites advance to better positions such as driver.