I agree that, if knowing about the afterlife is made likelier by being an experienced and powerful wizard, Dumbledore should be expected to know about the afterlife. However, we have now gone from "it's everybody's observations of the world" to "it's Harry's observations of the general public" to "it's Harry's observations of Dumbledore". In other words, Harry's (and our) evidence base for the lack of an afterlife keeps getting narrower the more we think about it.
In addition, it's worth noting that Dumbledore, for all his virtues, is also great at self-deception and confused thinking (plotting and strategy excepted). There are all manner of circumstances under which Dumbledore would be unaware of the existence of the afterlife - for example, if it led to a conclusion he was unable to accept, all his power and experience might not stop him flinching away.
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 95. The previous thread has passed 300 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.
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: