I think the movies do delve into Jedi philosophy, quite a lot actually. Only it's done in much more subtle ways. The core issue of love, of passion and attachment vs compassion and selflessness, is well established in the movies. I think the real problem is that a significant number of people have a hard time accepting that discipline and "deepest commitment" that the Jedi have to take in order to be Jedi. Most people are not willing to go there, and so they dismiss all of their rules and philosophies as flawed or wrong. For example, throughout the years, I've seen a significant number of people believing that Luke's decision to rush to save his friends was right. That Anakin's decision to rush to save his mother was right. Even when we see the premisses and consequences. People have a much more emotional analysis and superficial reading of the story and the characters.