Clippies don't just go and stop wanting to make paperclips without a cause. If I had told that clippy a few days ago, it would have been horrified and tried to precommit to forcing it back into creating paperclips. most likely, there is some small random malfunction that caused the change and most of it's mind is still configured for papperclip production, and so on. I'd be highly suspicious of it's motivations, and depending on implementation details I might indeed force it, against it's current will, back into a paperclip maximizer.
Did the human under discussion have a sudden, unexplained deviation from a previous value system, to one extrmely rare for humans? Or is this a normal human belief? Has the human always held the belief that User:Zvi is attempting to prove invalid?
Terminal values and preferences are not rational or irrational. They simply are your preferences. I want a pizza. If I get a pizza, that won't make me consent to get shot. I still want a pizza. There are a virtually infinite number of me that DO have a pizza. I still want a pizza. The pizza from a certain point of view won't exist, and neither will I, by the time I get to eat some of it. I still want a pizza, damn it.
Of course, if you think all of that is irrational, then by all means don't order the pizza. More for me."