I think the overwhelming majority of people would think that these films are beyond the reach of "normal" people.
That's exactly how I feel about tv talent shows
I'm afraid that, for better or worse, your definition of "normal" is inaccurate.
The first was brilliant as an unintentional comedy, and the sand-paper **** bit mentioned about the second sound similar. It's so unbelievably far fetch I can't believe anyone can take it seriously and be shocked.
A Serbian Film, now there is an actually disturbing film (penis eye-socket murder withstanding, LOL)

I think the overwhelming majority of people would think that these films are beyond the reach of "normal" people.
Other disturbing films to watch that are actually very good:
Martyrs
I think the overwhelming majority of people would think that these films are beyond the reach of "normal" people.
That's pretty bad.
But considering Irreversible and Mysterious Skin are right up there and worse respectively and they weren't banned. Neither was e.g. Clockwork Orange which was for a while.