Most treatments we have for anything largely boil down to pharmaceuticals, not just in psychiatry, so I don't really understand what is different here from other medical fields (I personally think there should be more prevention in general). At least, a lot of mental health research and treatments comes from psychologists who don't work using with prescriptions. It's definitely not a flawless field, but I don't think it's that different than any other when it comes to lobbying and regulations being driven by politics over science.