Since I believe in an objective reality that is beyond the limitations of our subjective comprehension, it is natural for me to accept the idea of "archetypes" as suggested by Carl Jung for example.
Jungian archetypes - Wikipedia, the free encyclopedia
The archetypes form a dynamic substratum common to all humanity, upon the foundation of which each individual builds his own experience of life, developing a unique array of psychological characteristics. Thus, while archetypes themselves may be conceived as a relative few innate nebulous forms, from these may arise innumerable images, symbols and patterns of behavior. While the emerging images and forms are apprehended consciously, the archetypes which inform them are elementary structures which are unconscious and more difficult to apprehend. Being unconscious, the existence of archetypes can only be deduced indirectly by examining behaviour, images, art, myths, etc. They are inherited potentials which are actualized when they enter consciousness as images or manifest in behaviour on interaction with the outside world.
Archetypes are a connection between conscious reality and our subjective interpretations. Piss Christ is just a subjective interpretation arrived at by some person with a need to vent and acquire self importance rather than ponder the archetype itself. Our difference seems to be that you deny the conscious origin of the archetype, while I respect and value it as a connection to consciousness and the cross is just such an archetype.
For you, prostituting it is meaningless because its meaning is just our own creation while to me prostituting it just prevents the archetype from becoming that bridge between conscious reality and our unconscious reactive life. I believe I understand what you mean but must disagree with it since IMO archetypes are connected to objective meaning.