The use of the unforgivable curses was only legalized for a fairly brief period, I doubt they explored the space of possible uses very thoroughly And for all we know, they did imperius people to use as binders, but stopped after the war ended and the use of unforgivable curses became illegal again.
Also, just because a society could do that, doesn't mean they would. You might say that any society could find or make an outgroup sufficiently unsympathetic that they would be willing to impose slavery on them, and slavery is likely to be a public good if you discount the values of the enslaved, but that doesn't mean that all societies will gravitate to slavery.
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: