This. When people talk about their rights they almost never mention anyone else who's right are being infringed upon by them exercising them and what the priorities of the rights are...
It's such a simple concept really. But some people and groups of people are just so selfish they would rather designate entire classes of population as less-than-humans to get around this.
I think many of these classifications are caused simply by doctors refusing to say "I just don't know" and patients refusing to accept that they really don't and probably never will...
Take IBS. We are supposed to believe that there is a disease with no known cause, so many possible triggers and influencers that anyone can find some that fit and wildly varying symptoms... something similar could probably be said for many other "syndromes". Of course all of those people have something else or a combination of something else but nobody wants to admit they just don't know and everyone wants a diagnosis.