I use the analogy of surgical instruments. Surgeons used to use butchers knives to operate on people. Barber and surgeon used to even be the same profession. Over a few hundred years they started to use fine scalpels and now they're beginning to use lasers.
For mental health though, they only stopped taking the butcher's knife approach a few decades ago. Hell, only now are people beginning to consider that maybe mental illness isn't some devilish possession or moral weakness. The "scalpels" we use even today are crude and blunt. They've still got a long way to go before they can treat mental illness with any precision
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