I am no lawyer, but "fair use" allows for reasonable reference/use of things from other people's stories and art. Parody is granted particularly wide latitude. That's why I can call the "hell" of my own story the "Eternally Unstuck Reflection of the Dark Side of Armageddon" (a dual Babylon 5 & Star Wars reference). Reference and parody is allowed, artists don't have the kind of total ownership and control that you are describing. I am no expert, or lawyer, but I know that "fair use" is pretty broad.
On paper yes, in practice, Fair Use is largely ignored if you don't have multi-million dollar lawyers. Granted, this is partly because of the larger problem of corporate legal bullying, but mostly because Fair Use, by its nature, is not concretely defined and so can only really be used defensively once a Copyright holder has become abusive. Most people do NOT want to fight it out in court unless something serious is at stake, certainly not a fun little commentary or review.
This, in turn, creates massive incentive for abuse, and it shows.
And, even if you are wanting to do something "non-canon", that should be up to the original author. I can only use my own story as an example, but if you know nothing about the military, don't understand the "engineering lore" and how to keep consistent with it, and have the exact opposite political beliefs that I do and want to infect my story with all of this... why should I be forced to allow you to do that? And ruin my story from both my own perspective and anyone who were fans of it?
Why do you think you should have the right to destroy someone elses "universe" when that person says that you just don't get it, and shouldn't be allowed to expand upon it?
If it's non-canon, I fail to see how it destroys the "universe" or "story" as you put it, as, by definition, anything non-canon does not really effect said universe or story. This is why I emphasized non-canon in the first place, as it solves all of your complaints, save for maybe the politics one. And as for politics, that's a problem with ANYTHING involving two or more people I'm afraid. No two people have the exact same politics, so any time you have to work with, reference, talk about, etc. another person or their work, there is the risk of conflicting politics irritating one or more people.
But to stifle creative works because of a problem that potentially exists within every human interaction ever, is a bit much I must say.