One way to answer this question: Philosophy courses can help us to recognize that there are numerous ways in which to approach a given problem. Many schools of philosophy have dealt with the same issues (free will; morality; epistemology, etc.) and have approached the topics quite differently, coming to quite different conclusions as well.
When we see that many "correct" answers are available to the same problem, we begin, hopefully, to recognize how important the role of choice is to our emphasis on one answer, or to our demands in insisting that our view is the right one. We see that, because multiple valid points of view can exist, our decision to insist on only one view is a decision, a choice, and not a defense of a necessary (or necessarily correct) position.