In addition to closing poor questions, the issue of deletion of extremely poor answers has been raised, so I'm posting to solicit a conversation on guidelines for deleting answers.
1. Off-topic answers
This refers to answers that do not address the question. (Exceptions would be answers that present relevant, corollary information that broadens understanding of the topic.)
Unlike misinformation, which arises from genuine lack of understanding, disinformation is intentional and malicious. (The remedy for misinformation is downvoting; for disinformation the remedy is deletion.)
Using an answer to promote a product. Also includes links to web resources not related to the subject of the question, or a relevant corollary subject.
4. Code of conduct violations
Goes without saying. Includes answers that are inflammatory, rude, contain profanity, or which target individuals who are not public figures.
Violations of the code of conduct will also likely result in bans, as the activity is clear cut.
For off-topic, disinformation & spam, which may be less clear in some cases, repeated instances can be grounds for a ban.
Let me know if I've missed anything, and any other thoughts on these guidelines.