Some are simply not up to it. Investigation of quack cancer clinics have found physicians, nurses, and others who became disillusioned with standard care because of the harsh realities of the side effects or acknowledged limitations of proven therapies. Beliefs encroachment . Science is limited to dealing with observable, measurable, and repeatable phenomena. Beliefs that transcend science fall into the realms of philosophy and religion.
Some people allow such beliefs to encroach upon their practices.
Individuals who wish to work in the area of religious belief should pursue a different career. The profit motive. Quackery can be extremely lucrative. Greed can motivate entrepreneurial practitioners to set ethical principles aside. The prophet motive .