I wanted to mark his old answer as accepted, but he changed it. So I'm going to repost it here and accept it. This is from devinb, you can find his profile here Maybe some day StackOverflow will permit us to accept prior revisions. I've redacted the parts that are nonsense.
answered 12 hours ago
devinb
8,5392735
Remarkably, I actually agree with Evan, although, as always, his aggressive attitude clouds the actual merit of anything he says.
This is a valid concern. If a user asks a question, and then they realize that it is terrible, or for whatever reason, they want it deleted. (perhaps they accidentally posted information which is private, or professionally detrimental, or just a case of brain freeze). There is currently no way for them to actually delete it. They can "soft delete", which means that everyone over 10k can still see it, AND it can still be reopened. This is problematic.
In the case of content which you want removed, editing still leaves it in edit history. And even still, perhaps the question itself concerns intellectual property, or algorithms which are not supposed to be publicized. Yes, the user is at fault for asking the question, but we are talking about their means of recourse.
If a user wants their own question gone, they should be able to remove it. Permanently. Yes, it will still end up available to the 10k users (of whom there are more and more) but the fact still stands that for whatever reason, the user does not want the information in the question on the internet anymore.
Summary: Self-deleted items should not be undeletable by 10k users.
Moderators and site-admins, as always, would still have the power to do so.