I use Case Studies to outline options and dilemmas faced by decision makers, e.g. every decision has advantages and disadvantages, creating a chain from incident back to root cause.
I'd say selectively and ethically. In the research literature I've encountered case studies, mainly in health care systems, most are simply problem focused-they can involve individual issues but these are more effective when related directly to what is or is not happening because of disputes/personalities/treatments etc.- e.g. this manager/department couldn't achieve x because of a.b.c. that h/she/it had been unable to resolve. He/it suggests that e.f.g. could be implemented to address the situation and achieve resolution. Look for Research papers using case studies for management issues.
Case studies are also chosen as a result of interesting event or phenomena that researchers pose the question, "Why did that happened?" or "how did this just happen?" So, if there is an event in a manangement or learning program, you may ask yourself why or how, and that could be your entry to doing a case study design.