Seconded. It is repeatedly implied in MoR that a noble child is, by default, a legitimate representative of their family, and anything that they do, or is done to them, is as if it was done by/to the family. For example, noble Slytherins get private chambers, even though they've done nothing to earn them within the context of the school's own regulations. Pretty much everything Draco does is considered to be a reflection on the House of Malfoy. It is considered natural for prepubescent children to know spells and rules of challenge designed for formal duels between noble houses.
In general, Rowling's universe assigns improbable values of agency and responsibility to children (socially speaking), and Eliezer only enhances this trend. Let's not forget that the Wizengamot doesn't blink an eyelid at sentencing a twelve-year old girl to die of slow torture for her crimes, or at a twelve-year old boy spontaneously giving away one of Britain's bigger fortunes to settle a blood debt. Death is an acceptable risk in exchange for having your child study at a wizarding school, with Hogwarts's no-deaths-for-fifty-years being seen as an amazing exception rather than a reasonable standard. Powerful magics are taught to children as soon as they are physically and mentally capable of casting them, with no reference to issues of maturity.
This may reflect the relatively slower pace of cultural development inside the Wizarding World : it's actually a rather recent change for young children to be treated as Western Civilization treats them. There are still people alive today who remember being allowing to carry rifles to school, as long as they kept the guns in their lockers between classes.
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 98. The previous thread is at nearly 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, 18, 19, 20, 21, 22, 23, 24, 25, 26.
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: