Who is Atticus’s client? How do the townspeople feel about Atticus’ defense of Tom Robinson? Why does Atticus intend to offer a good defense of Tom Robinson, despite the objections of his neighbors?

Atticus' client is Tom Robinson.

Atticus says many of the town people think he ought not defend Tom because he is black.

Atticus says that if he didn't take the case, he wouldn't be able to "hold up my head in town," represent his county in the legislature, or even tell his children what to do.