Re: "Fury" Kes, a Mirror Kes?
I doubt TPTB were purposely trying to enrage fans by ruining Kes.
We're lucky they even acknowledged the Kes fans at all. They're trying to run a tv program and can't cater to a vocal minority of the viewing audience. They probably thought it was a reasonable compromise that gave some closure to the character at the end of the episode. Obviously, they were not going to bring her back as a main character since Seven joined. And I don't think Jennifer Lien would've agreed to the episode if she thought its sole purpose was to intentionally ruin the character and piss off fans.
Space, time, and thought are not the separate things they appear to be.