* Should a defense attorney work for a client he believes to be guilty?
It depends if the attorney just wants to make money or if he believes in justice. If he believes in justice, he would not represent him because he would want him to go to jail. But if he just wanted his money & did not care aobut society he would represent him and try to get his money.

* Should a secretary keep quiet about a supervisor who adds personal expenses to business-expense reimbursement claims?
The secretary shouldn't keep quiet because its wrong. But he most likely would keep quiet because we would want to keep his job so he could have a living.