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Ketamine is only ever recommended as a last ditch treatment in most situations as it comes with it a pretty high risk of psychotic issues. Which is the reason it is only really used on children - for some unknown reason they have much lower risk.
But more importantly, you seem to be ignoring the fact that ketamine is intentionally being abused as a recreational drug exactly for it's psychotic effects. I think the link between abusing a drug for its psychotic effects and... uh... psychotic actions would be pretty direct.