My worry was that this would revise my values: after gaining that specific knowledge, my brain would excessively value replying to the reports over working on my current project.

These are not the same types of values. You were worried about your values about priorities changing, while under time pressure. WrongBot is worried about his moral values changing about he treats certain groups of people.

I'm having trouble seeing this distinction. What if I had a moral obligation to do as well as possible on my current project, because people were depending on me, say? My concern would be that, if I read the reports, I would feel a pull to act immorally. I might even rationalize away the immorality under the influence of this pull. In effect, I would act according to different moral values. Would that make the situation more analogous in your view, or would something still be missing?

I'm getting the sense that the problem with my example is that it has nothing to do with political correctness. Is it key for you that WrongBot wants to keep information out of his/her brain because of political correctness specifically?

But in the "twiddled" version, I don't know when the safe conditions will occur . . .

True, but there wasn't the same magnitude or type of uncertainty, right? You knew that you would probably be able to read your reports after your deadline...? All predictions about the future are uncertain, but not all types of uncertainty are created equal.

I called it a "twiddled" version because I was thinking of the uncertainty as a continuous parameter that I could set to a wide spectrum of values. In the actual situation, the dial was pegged at "almost complete certainty". But I can imagine situations where I'm very uncertain. It looks like part of your problem with this is that such a quantitative change amounts to a qualitative change in your view. Is that right?

I would be interested to hear your opinion of a little thought experiment. What if I was a creationist, and you recommend me a book debunking creationism. I say that I won't read it because it might change my values, at least not only the conditions are safe for me. If I say that I can't read it this week because I have a deadline, but maybe next week, you'll probably give me a pass. But what if I put off reading it indefinitely? Is that rational?

I take it that your concern would be that losing creationism would change your moral values in a dangerous way. Whether you are being rational then depends on what "put off reading it indefinitely" means. I would say that you are being rational to avoid the book for now only if you are making a good-faith effort to determine rationally the conditions under which it would be safe to read the book, with the intention of reading the book once you've found sufficiently safe conditions.