My reason for trying to delete it was also privacy related, although it will seem like a minor thing. It turns out that when you initially sign up, they turn any friend you have on facebook into someone you "follow" on Quora. My list of facebook friends is not public information. The list of people you follow on Quora is. Ergo, they turned a subset of my private friends list into a public list that anyone could see, and without warning.
Again, seems like a minor thing, but in principle it was a privacy violation, so as soon as I realized this I attempted to delete the account.