"If you just take the attitude that, however bad it is in anyway, it’s always your fault and you just fix it as best you can – the so-called ‘iron prescription’ – I think that really works."
...does not work for e.g. victims of child abuse. Child abuse is never the fault of the child.
Of course, any abuse inflicted on you is not your fault. I wouldn't take that phrase "always your fault" literally. It is about how you react to it afterwards and what you do to get back up. As he also said "you just fix it as best you can". I would focus on that phrase more.
So the child is expected to solve their own sexual assault instead? You must understand how ridiculous this sounds to look at a child being assaulted and expected the child to fix their own abuse.
To me the crux of it is it's not an advice or metaphor.
Telling people to stop feeling the way they feel is good for motivational posters, but not something to tell people expecting them to think long and deep about it.
"If you just take the attitude that, however bad it is in anyway, it’s always your fault and you just fix it as best you can – the so-called ‘iron prescription’ – I think that really works."
...does not work for e.g. victims of child abuse. Child abuse is never the fault of the child.