To those who reply "ignorance" to claims of pseudoscience where psychiatry and much of psychology are concerned, there is a very simple and, in the sciences, universally accepted, not to mention less contentious, way to demonstrate these disciplines' authenticity: share the citations to the convergent published international evidence that "mental illness" is generally legitimately biological, including the isolated biological causal agents and the well-defined mode of physical pathology, that corroborates the biomedical model of mental illness. The same as the rest of the medical world is obliged to do to validate a claim of disease.
More, legitimate biomedical illness proponents can provide the validated physical diagnostic protocols for both defining a mental disease (how are the diseases discovered and decided upon?) and diagnosing it in patients (what are the direct, not associational, molecular tests that with high confidence and precision show the causal agents to be present?).
Finally, what are the rigorous scientific grounds justifying physical restraint, forced invasive treatment, and suspension of civil rights of individuals who consistently and coherently express a will to die while allowing other (adult) patients the dignity and autonomy to deny even treatment nearly all physicians recognize as extremely likely to prolong lifespan? To suspend an individual's civil rights ought to require a substantial, empirically evidenced, objective justification that doesn't rest merely on individuals', professionals', or a culture's normative worldview.