If the gerson therapy can cure all cancers and many illnesses. why does the primary health care system exclude it?

Beware false claims: If a treatment is based on fake science, it is called fake medicine, which would be uselesss in the case of caring for minor illnesses (such as a common cold), and outright dangerous in the case of serious or deadly diseases (such as cancer). Unfortunately, in our world, serious false claims sometimes come from a doctor, a scientist, or even a president (for example, global warming truly is real).