As a 20k rep user, I can vote to delete questions, but I can't vote to delete my own questions.
For example, Do you trust code that works the first time? should be deleted, it doesn't belong on Stack Overflow.
I understand and am fine with not being able to one-click delete it since it has upvoted answers, but I should be able to cast a delete vote for it.
In other words, the rules that prevent one-click deletion by the owner should not supersede the vote-to-delete rules one has for normal posts.