As far as him saying 15% is genes that is a total guess.
He doesn't know that.
We are born with a personality, the nature/nurture balance is different for everyone.

Some will survive abuse better than others. My elder sis and I suffered badly.
My middle sister? Totally different, not sensitive at all tough, resliant, defiant.

Like I was reading about Erin Pizzey. She was the first person to create a refuge for battered women in the UK.
She recounted how bad her own childhood was. Her parents (if i remember coŕrectly) were highly intelligent and both doctors.

But home life was a nightmare, violence, bullying and abuse.
Her sister and brother, were both badly affected, silent, withdrawn and very fearful. Destroyed.

She was different however. Resilant, loud, determined. She answered back, fearless, angry she defied them regardless.

As an adult she became famous for her work with battered woman. She is also an author.

Why did she survive reasonably well while her siblings did not?

Genes saved her.
I suspect she herself might be on the low empathy spectrum (like her parents) with psycopathic traits. That would explain her exterordinary resisilance.

The nature/nurture debate is hard to quantify as there are so many variables.

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