I'm actually quite in sympathy with the OP. Can't see myself in the position of making travelling more complicated than it is but I'm fully in support of people standing up for a principle; even if it's perceived to be minor and not worth the bother.
I think that most would agree that in the last forty years there's been a huge change in our basic rights but can anyone really say that "at this point it changed"? The OP has posed a genuine question. Cheap shots are easy but perhaps the underlying question is worthy of discussion?
Perhaps, but I'd venture NOT in the context of the IPC.
What does the IPC do? It obliges the incoming passenger to make a positive declaration, signed as to its accuracy, with legal effect, about whether they are bringing in certain
prohibited goods such as (possibly diseased) foodstuffs, animals, firearms, dutiable goods etc. Contact details, origin of flight etc.
Hopefully its pretty obvious why the border people and 'Gov'mint' want to know there things. Contact details? If the day after someone arrives they find the pax sitting next to them had Ebola, hopefully they'd want the heath system to find them, right?
Details can be debated but the intent and benefit of the IPC I think can't be argued. Not rationally, anyway.
Shouldn't need to be signed? - Then it becomes meaningless, unenforceable and the benefits flushed.
So that just leaves those pax who think that they are so special that their situation over-rides the collective benefit of controlling what comes into the country wrt agriculture, prohibit goods etc.
Go ahead, Princess, OP - strut your stuff, demonstrate your rights, make a stand. Someone so special deserves to be treated differently. But remember, in the back-offices of BF at airports, no-one can hear you scream as you prepare for an internal examination.