[Wowfunhappy]

I agree. The logic is similar to why you can't delete an HN comment once someone replies.

[jbverschoor]

Well sure. But what happens if your post contained some confidential data? It gets redacted

[Wowfunhappy]

Yes, but you have to email the HN mods, so there's a form of review built into the process. It can't be done unilaterally.