Well, I take his point - if you don't know why he had a psychotic break in the first place it seems unlikely that you can assess whether he's going to have others in future. If it's an NCR issue, "having a violent personality" is not what we're talking about. We're talking about completely losing control of one's ability to make decisions.
That being said, at 0.6%, the statistics are pretty tough to deny. The system appears to work incredibly well. That's enough for me to have some faith that this is the right decision.
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"The great promise of the Internet was that more information would automatically yield better decisions. The great disappointment is that more information actually yields more possibilities to confirm what you already believed anyway." - Brian Eno
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