What are the most difficult aspects of responding to a murky situation those situation in which you sense the presence of unethical and/or illegal behavior but haven't seen unequivocal proof of wrongdoing?

What are the risk of waiting for unequivocal proof before beginning to take action? What are the risk of acting decisively based on your "gut" sense of a situation?

What is different about acting ethically/ responsibly within an organizational environment/ culture like that of the Pioneer Fund versus acting ethically/ responsibly as an individual? What are the particular challenges and dynamics associated with ethical and responsible behavior in an organisation ?