Lucius's social capital is limited. Some of the Wizengamot are his fast allies, some are simply biased in favor of the nobility, but if he was regularly being accused of imperiusing people, and showed signs of more and more people holding to agreements with him that were clearly not in their interests, he'd probably get the aurors on his trail. Except for the people who're Death Eaters themselves, or most of the way there, he'd go from "One of Us, even if he's involved in some sketchy stuff" to "A pressing threat."
Your points are good, and I understand what you are saying, and that probably is enough reason to accept why Lucius is not imperioing people in the story, without positing that you cannot bind an Unbreakable Vow while under an Imperius.
However, with that said, I don't think you understand just how powerful the Unbreakable Vow is. There is a reason why EY nefed it so much in HPMOR, and if you can simply get around that with a simple Imperius curse... Maybe in this alternate world the Imperius curse would still be illegal, but I doubt it. Because the people ...
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 87. The previous thread has passed 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: