Only a sane person can install "the core". To be really sane, one cannot accept insanity as sanity. Conforming does not make an insane stance sane. True sanity is a correct form of conformism, tested against reality. It's sanity a posteriori.

All conformist sanity when performed inside society, is a priori sanity. It breeds cancer and kills the host. This is all fine, as long as someone comes through.

The core is the ability to process information as it is. This is what the shaman will do.