The Ewells are the type of people for whom little can be done that will lead them to a better life. The father is an incorrigible reprobate who beats his children and drinks and spends the welfare money on himself. Since the children are starving and scouring the dump for anything they can eat, no one objects when Bob Ewell goes hunting during the off-season.
About their exceptionality, Atticus explains that the Ewells were "members of an exclusive society," so the children do not have to attend school, and their father, Bob, is allowed to hunt during the off-season. Atticus says,
It's against the law, all right, and it's certainly bad, but when a man spends his relief checks on green whiskey his children have a way of crying from hunter pains.
Atticus adds that he knows of no landowner who would begrudge the Ewell children any game their father can shoot.