I haven't seen any meta-discussion on protecting questions, and I don't see this privilege used very often. When do people feel it is appropriate to protect a question?
I protect questions when:
- They are old (1 year or more)
- They have multiple (often 10 or more) answers
- Several of those answers have high answer scores, and one is accepted
- The delete log shows the question has a history of attracting low-quality answers from new users
In my experience, #4 most often occurs for questions about Nazis and the Confederacy--two topics on which non-historians can have strong opinions. Topic influences my decisions at the margins, but 1-4 are the most important.