What is causing formatting to break? has 6 spam answers which have been deleted from our friend the Community user when the spammer account was destroyed.
Should not the question be automatically protected in such cases?
Since in this case the answers are very similar, maybe that could be used to decide when the question should be protected. At least, that would help with people who keep creating different accounts just to post the same answer (which, in most of the cases, is spam).
The screenshot doesn't show this, but there is another answer (written today) that starts with "This is very much interesting. Thanks for sharing this useful information."
I still think that a generic algorithm that would automatically protect question with X answers written from deleted accounts would be a better idea, especially now that the reason for destroying the account is recorded. (Moderators are asked to choose between two given reasons or enter a custom one.)