How about this: Atticus Finch is a model citizen, and model lawyer, in all his action he models the virtuous life to his children. (Phew!)
You could explore:
Is he naturally a moral man, or does he act for his children?
What kind of citizen do we need in our democracy and does he embody those qualities?
What moral lesson do the children learn by reading to the drug addict? I can't remember her name. (It's not as simple as "don't use drugs.")
these are the questions I still think about when I remember that fantastic book.
Is he self-conascious about this teachinjg