There is an interesting element of the Star Wars theology, if you will, that parallels one of my favorite verses in the Book of Mormon - and constitutes a non-doctrinal reason I am as active as I am (completely, including being a temple worker and coordinator). Interestingly, both the Star Wars element and the Book of Mormon verse tend to be simplified by most fans / members with whom I have spoken.
In Star Wars, there is a dark side and a light side - and there are subtle points when it is clear that the duality within each person is central to "balancing the force". In a real way, without the dark side there would be no true light side - and the light side eventually would become the dark side.
There is a Book of Mormon verse that says there has to be opposition in all things, but few people consider that enough to realize the implications of that all-encompassing wording. "All" things includes each person - and it also includes the LDS Church (and every other religion) itself. There MUST NEEDS be opposition in the LDS Church.
I stay, in one way, to provide balance to the LDS force - to provide opposition in all things - to keep my people diverse. However, I try to do so in a way that truly constitutes a balance - moderation - unity despite difference - charity - etc. I am NOT trying to be the one true voice that corrects and contradicts and, in the ideal end, converts and, in practical terms, silences opposing views; I am not convinced I understand everything well enough to be confident I am right and others are wrong in many cases, and I don't want my view to become the new, exclusive orthodoxy.
I just know balance and opposition in all things are harmed when I (and every other individual) is absent and/or silent - so I stay partly to help others feel comfortable expressing their own views, as well, even when I disagree with them.