No hunting! It is mean! Plus, you never know when your psycho neighbor is going to flip out and and punish you with her "Magic Finger" (does that sound dirty to anyone else?). Better to stay inside where it's safe. Don't answer the door to any kids, or ducks.
This seems preachier than is the norm for Dahl. The magic isn't developed, and we don't spend enough time with the narrator to know her or care about her. The way in which the narrator characterized her magic finger as something outside herself and not under her control, while Dahl makes it clear that her feelings direct what happens, could have led to a really interesting psychological examination of anger and action and valuable points about responsibility and self-control. I would rather have had a longer book that dealt with those issues.