Difficult decisions in engineering: Ethical dilemmas that await the engineer and how they are best handled

One doesn't have to be a news watcher for very long before realizing that engineers face difficult ethical decisions. In what way are these decisions problematic? Often it is arduous simply to discern right from wrong. But even if the proper course of action is obvious, this may be of little comfort to us, since making the ethically right decision can be very costly. Imagine yourself in the following situations. How would you respond?