This snippet from an excellent argument on Mormon Artist.
We Mormons have the same expectations of Church members in almost all other professions. We expect, for instance, that dentists will favor dentistry over promoting religious orthodoxy while they are at work. To illustrate, we don’t expect dentists to give the missionary discussions to clients strapped, mouths agape, in the dentist chair. Nor do we expect accountants to slip copies of their testimonies in with their client’s tax returns. Dentists and accountants may be inspired in certain instances to share their beliefs, but we generally don’t expect such acts to be a mainstay of their professions. We shouldn’t expect it from artists either.
This saves me a blog post, really. What's more important, though, is why so many assume that artists should be doing more evangelical work than a dentist, because they do. My wife's Uncle Joe has been making this same argument about "uplifting work" for a long time.