Hunting out of season is frowned upon by the citizens of Maycomb because overhunting leads to no hunting.
Hunting is an important pastime in the South. It is a tradition, especially for me, to go hunting during the season. The townspeople know that if they hunt out of season the population of hunted animals will dwindle and no one will be able to hunt. Scout is aghast when she learns that Bob Ewell is allowed to hunt.
“It’s against the law, all right,” said my father, “and it’s certainly bad, but when a man spends his relief checks on green whiskey his children have a way of crying from hunger pains. I don’t know of any landowner around here who begrudgesthose children any game their father can hit.” (ch 3)
You can see how important hunting is to Southern life in Scout’s description of her father.
He did not do the things our schoolmates’ fathers did: he never went hunting, he did not play poker or fish or drink or smoke. He sat in the livingroom and read. (ch 10)
It is part of the Southern identity. Scout thinks her father is unusual because he does not hunt. She is ashamed of him for it. Of course, then he shoots the rabid dog and earns her admiration!
Hunting is not viewed that differently today in the South!