You're treating Kyubey like its actions can be taken at face value, as though it's ever been completely honest at any point in the series (three specific instances aside- when Madoka made her wish and it was surprised, when the universe was being rewritten, and after Homura took over), and like it's human. That's exactly what it wants. What it's designed to do.
Okay, I think you're moving wildly away from what we've seen in PMMM and PMAS and into your own interpretation of Kyubey's character. A valid one, but not one I agree with. For me, computers don't have the kind of curiosity Kyubey does, or repsects in others.
Kyubeys always answers the questions asked - to the extent of the question and no further, but honestly. It even says
"You humans don't ask the right questions." In this quest, it has displayed a great deal of curiosity unrelated to its main goal, and respected it in others. Not like a computer at all.
If Kyubey were really a computer only concerned about efficiency, it could easily take a more active hand in driving girls to despair than it does.
Yes, it sometimes looks all reasonable. We know this is misdirection, because it's goal-directed, we know what its goal is, and it isn't friendly in the slightest.
Give me one time when Kyubey lies. Directly. I'm not talking about human standards, I'm talking about telling a direct falsehood in response to a question asked. I don't think you're right about the reason Kyubey answers questions.
And yes, we know its main goal - saving the universe. We know it has a fairly utilitarian perspective. We know it gives girls a chance to wish for what they want before they're killed for the sake of the universe. I'm not saying it's a good thing. But they could probably have shoved girls into the equivalent of a magic meat grinder and achieved the same effect.
There's an excellent post I'm trying to find which explains the Incubators actions in Rebellion as a twisted but moral way of extending Homura's life AND doing science.
They're not nice. They're alien and incredibly dangerous. But they're not implacable and evil and avoiding talking will have bad consequences for us.