Should a question be marked with a tag such as database-mirroring if the OP identifies that mirroring doesn't apply?
For reference, see this question which has 3 tags about tech the OP has identified that wouldn't be an answer to his problem.
What are tags, and how should I use them?
A tag is a word or phrase that describes the topic of the question. Tags are a means of connecting experts with questions they will be able to answer by sorting questions into specific, well-defined categories.
Tags can also be used to help you identify questions that are interesting or relevant to you.
With this in mind, I would say in general contraindicated tags should be avoided, and perhaps even removed from affected questions.