Identify the central ethical issues involved in the following case:
Six years ago Diane Carlson and Dina Sawyer founded a not-for-profit organization called Green Streams, which extracts recyclable materials from the waste streams of local manufacturers and sells them for scrap. The employees of Green Streams are recent graduates from drug rehabilitation programs. From the beginning, Diane and Dina introduced a 'one strike and you're out' rule. If an employee is caught even once doing drugs, drinking alcohol, stealing, or fighting on the job, he or she is dismissed on the spot. Diane and Dina enforce this rule without exception. They believe that the success of their program depends on their reputation for integrity. One of their greatest 'successes' is Angela Youngblood, a single mother who cares for her neurologically impaired four-year-old at home. Angela has been clean since her son was born and has been promoted twice. She is now a supervisor and destined for a management position. And so it was with dismay that Diane and Dina learned that Angela was skimming waste for her own profit. When they confronted Angela, she broke down immediately. She told them she needed the extra money to pay for her son's medical bills and begged them to let her keep her job. "If I lose this job," she sobbed, "I will have no place to go. No one will hire me with my record. I will lose my home. I will lose my boy." Diane and Dina asked her to wait outside while they talk it over. Diane believes they have no choice but to fire her; Dina thinks she deserves a second chance.