I'm get really sick of such statements.
Helfgott was badly maltreated and that is terrible enough.
To say, he would have got the psychotic phases in any case means to play down the cruelty he suffered in his childhood.
Sorry you're feeling ill, but I didn't downplay his mistreatment. Nor did I excuse the cruelty. It's simply the case that mental illness in children is often misinterpreted as behavioral problems. Therefore the stupid parents become unusually punitive. This appears to be part of the problem in the Helfgott case. The cruel treatment exacerbates what is already there in the emergin pathology.
Helfgott would have suffered from psychosis no matter who parented him. His parents, however, made his case so much worse.
Not all severely abused children become psychotic. That's the point. And why? The argument being that psychosis does not have a straight-line correllation with abuse. It is widely interpreted as being a brain disease. Something organic and innate that nothing will prevent from emerging. Not even great parenting. If you've ever worked with psychotics, as I have, you would know this. Perfectly wonderful parents find they are rearing schizophrenic children. Psychotic disorders most often have no connection to abuse. That's a demonstrable scientific fact.
Psychosis, unlike neurosis, is a break with reality. What's going on for the psychotic does not correspond to what is really going on outside of them. Helfgott displayed all the symptoms: difficulty in connecting with others, isolation, auditory hallucinations, almost non-existent social skills. His triumph is that he overcame psychosis to be a productive musician. I admire him immensely.
Now, please feel better.