This brief piece is based on personal experiences. It won't cover the entirety of such a complex problem, but it fits with some other modes of my thinking, whereby broader ideas might resonate with one or more objective ones.
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There is a paradox to paranoia, which is a condition that is necessarily complex, and is perhaps aggravated for one, by a connectionist view of the mind. For example, in organisations, the paranoid person with little personal insight, will receive many bombardments due to other people's subtleties of body language and vocal tones, and those people's difficulties to empathise with the sufferer, who for starters, they don't view as ill. In fact, the sufferer doesn't either, but the nonuniform nature of the environment can overwhelm, and generate increased anxiety that feeds paranoia.
So, the cruel paradox is this: to overcome the paranoia, you could perhaps gain greater personal insights through life experiences, but life experiences cause anxieties that feed paranoia, partly because a significant lack of insight can provoke reactions from others, and at the same time, sadly, the more negative reactions are useful data, and need to be understood.