Five answers:
- To understand people better at a general level.
- To better deal with really difficult situations. These can be caused by staff, employees, supervisors, constituents, major donors, or your peers. Such situations can even be caused by CEOs, senior pastors, elders/deacons, or audit partners sometimes. (Did I really say that? Yep. I did.)
- Because you don’t have the time, money, or interest to get a PhD in psychology in order to understand people better.
- Because Christians can successfully integrate psychological theory with faith. For examples, see Focus on Family and Narramore Christian Foundation.
- Because leaders need to be well-rounded with a general understanding in lots of fields of knowledge.
As a result, I will start discussing some books I have read that might be of help to you. There are wonderful resources available that are understandable by a layperson.