They don't form a unified pro-Imperius voting bloc. Any individual who tries to bind people in this way is a social threat to anyone who doesn't trust them absolutely.
Aha! I think I spot the misunderstanding: In this scenario, no one is trying to "bind people in this way". I am not positing that you do use the Imperius curse to make other people make an Unbreakable Vow to you, but rather I am positing that pairs of people both agree to make an Unbreakable Vow between the pair of them (with the Imperius curse used on the binder), so that they can reap the benefits of mutual cooperation.
As such, it is absurd to say they wouldn't form a unified voting block. Their power comes from the fact that they are magically unified, so that they can trust one another absolutely.
In that case, they might be able to form a unified voting bloc, but even so they're going to appear as an active threat to everyone else. Things like this are among the reasons why the Imperius curse is as forbidden as it is. If the people attempting this were caught, it wouldn't matter if they were all voting in favor of its legality, any more than we would let convicted murdering congressmen try to pass a bill legalizing murder. It's not something that the rest of society is likely to be amenable to if a bunch of lawmakers stand up for it, the fact that they would vote for it at all would be highly suspicious and threatening to their social standings.
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: