2) even if they were somehow proven to be the same there is still no reason why the same standards need to be applied to computer programs and humans because computer programs do not have any rights or legal protections.
3) cognition is not a "special exception to copyright" because it is entirely unrelated. "Copy" "right" is who has rights to make copies. Your thoughts are not considered copies because they are intangible.
4) we do not "judge every thought individually as to it's originality" because other peoples' thoughts are entirely opaque. Nobody is judging your thoughts, and if you think they are you need to take your medications.