I think I see the problem. Tell me what your response to this article is. Do you see messy self-modification in pursuit of goals at the expense of a bit of epistemic rationality to be a valid option to take? Is Dark == Bad? In your post, you say that it is generally better not to believe falsehoods. My response to that is that things which depend on what you expect to happen are the exception to that heuristic.

Life outcomes are in large part determined by your background that you can't change, but expecting to be able to change that will lead you to ignore fewer opportunities to get out of that situation. This post about luck is also relevant.