While it's true there's no accounting for taste, I suggest you consult the dictionary on the definition of 'drivel'.
At the end of the day, PG can do, essentially, whatever he likes with the content, routing (or lack there of), and posting permissions on Hacker News. It's HIS site.
It's a shame that ScribD doesn't seem to play by an equivalent set of ownership principles. Namely, hosting and making money off other creator's content without so much as asking their permission; let alone proffering any ad-revenue sharing.