I would say that they can stay as long as they are used as an example in service to a more general point that applies to community moderation in general, and not just SE.
Mean Mod X deleted my question just because I asked a [totally appropriate and on topic question]. How do I exact vengeance upon him for abusing his powers?
I disagree with how a mod closed my [on topic question]. What is a fair and efficient mechanism for community members to dispute moderator actions?
I disagree with how a mod closed my [on topic question], but our site does not have a mechanism to dispute mod actions. How should I go about proposing adding X to allow community members to dispute moderator actions in the future?
This would also apply to answers. SE policy is a valid source of guidance, but SE should not be the only source.
If this type of thing happens often enough, maybe it should be a custom close reason.