Wouldn't the data we have on mental health show that contemporary wisdom on its treatment is failing? Given spikes in rates of anxiety and depression over the past century, among other adverse effects, this isn't an unreasonable conclusion to make.
That said, maybe it's more important to look at how these have been dealt with in the past than the data we have in the present.
The spike can just as well be caused by bad environment we made for ourselves, ecologically and psychologically.
The problem is, we really do not know what we're doing when dealing with mental issues. Typical western approach is only slightly better than dosing people with random psychedelic substances of mostly unknown effects. The science done in field of psychotherapy is low to non-existent quality. Methodologies are in their infancy.
That said, maybe it's more important to look at how these have been dealt with in the past than the data we have in the present.