The isolated and rudimentary programme, active from the late 1980s, was closed suddenly in 2004 after government investigators concluded it operated with a culture of violence with a majority of residents suffering assault.
Dyson told TVNZ: "A lot of government money was put into that programme. And, in the end, it resulted in the state funding violence and abuse towards young people. That's how horrific it is."
Sunday also interviewed David Bagely, the key witness in a 2015 Herald expose on Whakapakari showing residents had been made to dig what they were told were their own graves and subject to mock-executions.
RETURN TO THE ISLANDFULL CLIP: How did a taxpayer-funded boot camp for troubled teens end up damaging many of them for life? Here's the full clip of Jehan Casinader's story.
The Government says its historic claims process is robust, and there's no need for an independent inquiry. Do you agree? Tell us in the comments below.
Posted by Sunday TVNZ on Sunday, 6 August 2017
This incident was never properly investigated, despite multiple complaints from residents and Whakapakari staff, with the Children's Commissioner later writing a report highly critical of the Ministry's handling of the affair.
The Herald has reported extensively on the Whakapakari programme, and the tortured quest by former residents for justice.
Attempts to seek redress through the courts have met stiff opposition from government, with the Ministry spending more than $1m fighting a handful of claims for more than a decade before recently settling for a fraction of this legal bill.