What am I making up exactly? Jesper's medical issues and its consequences reached a breaking point within the band, then he left or was let go, but everyone was pretty awkward about it, and it was everything but amicable. No glorious send-off to the forming member behind the band, awkwardi nterviews about his departure all around, and Jesper later expressed some animosity as well, mostly towards Anders. So don't give me that bullshit that I am making up a story, when in reality it was a completely normal and healthy departure from the band.
Now, if you don't buy that FitW is at least somewhat inspired by Jesper, then that is your perogative, it MAY not be, but let's just say it is quite the coincidence that the song which lyrics in their entire catalogue would probably fit that situation the most came right after his departure. I'm not saying it's a foolproof assumption, because R2R's lyrics would also fit this scenario, even though that one is clearly not about Jesper, but it is well within a reasonable assumption. That being said R2R is closer to a battle cry, while FitW is very personal.
I'd like to stress the inspired part as well, because I don't think Anders, who avoids confrontation in public, was writing that song as a sort of "fuck you" to Jesper, but it would be hard to deny that the event wasn't looming over his mind during the writing process. This same record has the Jester's Door as well.