You're missing the point of talking about opposition. The AI doesn't want the outcome of opposition because that has terrible effects on the well-being its trying to maximize, unlike the nazis. This isn't about winning the war, its about the consequence of war on the measured well-being of people and other people who live in a society where an AI would kill people for what amounted to thought-crime.

And if the machine thinks that's the best way to make people happy (for whatever horrible reason--perhaps it is convinced by the Repugnant Conclusion and wants to maximize utility by wiping out all the immiserated Russians), we're still in trouble.

This specifically violates the assumption that the AI has well modeled how any given human measures their well-being.

However, if you're trying to describe an AI that is set to maximize human value, understands the complexities of the human mind, and won't make such mistakes, then you are describing friendly AI.

It is the assumption that it models human well-being at least as well as the best a human can model the well-being function of another. However, this constraint by itself does not solve friendly AI, because in a less constrained problem than the one I outlined, the most common response for an AI trying to maximize what humans value is that it will change and rewire what humans value to something more easy to maximize. The entire purpose of this post is to question whether it could achieve this without the ability to manually rewire human values (e.g., could this be done through persuasion?). In other words, you're claiming friendly AI is solved more easily than the constrained question I posed in the post.