The tv-shows tag should only be used when referring to the creation or editing of tv-shows in a general sense and should not be used when talking about a specific show.
For example:
If your question is Why are there credits at the end of TV shows even though only Unicorns read them?
- This question is about TV-Shows in a general sense, go ahead and use the tv-shows tag.
But if your question is Why did Dexter shoot the pony instead of stab the unicorn?
- This question is about a specific show: Dexter which is a TV show, but does not apply to ALL TV Shows, tag it with dexter