Death and suffering can be sad even when its causal consequences are net-positive. And death and suffering can be sad even when it happens to bad people (to say nothing of their families).
Normatively speaking, I don't believe someone can involuntarily 'forfeit their life' in the sense of making it intrinsically OK to kill them. (Though it may be instrumentally necessary.)
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 117.
Plans for next chapter release:
There is 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.)