But experts are people, too, and they have their own assumptions upon which they rely. A classic example I've written about is the assumption that Joseph Smith wrote anonymous articles in the Times and Seasons. These articles have shown up in Church manuals as teachings of Joseph Smith, even though it is now apparent he had nothing to do with them and even, in some cases, opposed them.
One fascinating aspect of this is that people on both sides of an issue may make the same assumptions--even when the assumptions are wrong. Hence, we have BYU-trained experts and staunch anti-Mormon activists debating over historical or doctrinal issues, based on mutual assumptions that, in many cases, are inaccurate. A classic example of this one is the debate over the Book of Abraham, which I've discussed elsewhere.
I came across this list of the 20 worst assumptions made by experts. Lots of analogies to what has been going on among LDS scholars and educators. I can't vouch for the accuracy of the list because i haven't checked it. The list was compiled by Paul Sloane who writes and speaks on innovation and lateral thinking. He is the author of The Leader’s Guide to Lateral Thinking Skills from which this list is taken.