Because children are not fully capable of taking care of themselves, and so there is a norm that all adults (and older children) have a duty of helping and protecting them (even against themselves).
And also because if an adult harms a child, it is much more likely that the victim is innocent and didn't "deserve" that harm than if the victim is an adult.
(and I don't think "greater moral value" accurately describes the situation)
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.)