Bohr thought that our experiences should be recognized as a legitimate reality that could enter into physics theory. Of course, our experiences are surely not the totality of reality. So one would like to have a rationally coherent theory that puts these parts of reality into a larger cohesive theory. Heisenberg, von Neumann, and Wigner showed how Bohr's idea could be expanded to accomplish this. Scientific theories allow us to organize our experiences, and make useful testable prediction about what we can expect to experience in certain sorts of situations.
Experiences are part of the totality of reality.
This argument is that an examination of the principles of CM shows that these principles provide no way of passing from objective to subjective. In pre-quantum theory there was no doubt as to how this was to be understood. In quantum theory it is not so easily seen. But I think the only correct way to challenge such a seemingly secure point is to look at the arguments again. Stapp's position is that this C is an intrinsic part of quantum theory, and I can accept this view of QM as an important stage in the history of science.