Socio-cultural reasons cited include

the low level of scientific literacy among the public at large
an increase in anti-intellectualism and antiscientific attitudes riding on the coattails of new age mysticism
vigorous marketing of extravagant claims by the "alternative" medical community
inadequate media scrutiny and attacks on critics
increasing social malaise and mistrust of traditional authority figures - the antidoctor backlash.
dislike of the delivery methods of scientific biomedicine