His visit to the Christmas Island detention centre had been a "typical show of public relations by numbers," he added.
"We were welcomed by friendly, smiling Serco staff, given bottles of water, even a free lunch from the Border Force [Australian Immigration] boss. He was polite and answered questions. However, his answers sugar-coated what is going on.
"The detainees, who we met two at a time and were brought in from different units around the detention centre, told consistent stories. They described being traumatised by their experiences, depressed at their situation, angered by the unfairness of it all, fearful for their families and futures. Despair and hopelessness overwhelm them, and many are pushed to the brink.
"They are called the 501s, because s.501 of the Australian Migration Act legalises what is happening to them. That Act was designed to address the threat of terrorism. Our boys I met with are not terrorists, nor are they murderers and sex offenders. I've seen scarier-looking guys out the back of my marae peeling spuds and opening kina.
"That they are more than just blokes who have done time for low-level crime is a blatant lie by the Australian Minister of Immigration to justify his draconian regime. Many asylum-seekers and other ethnicities have been transported back to mainland Australia, while Christmas Island fills up with Maori and Pacific Island Kiwis. It stinks of racism, and New Zealanders are the target.
"If the government supports Australia's bid to join the United Nations' Human Rights Council, New Zealand will have turned its back on New Zealand citizens who need their help."
New Zealand's Foreign Affairs had not been in contact with any New Zealand detainees, while Mr Key had washed his hands of any responsibility for the people he was meant to represent.
"He does not have the moral fibre to stand up to his new friend, Australian Prime Minister Malcolm Turnbull, and resolve these human rights abuses against his own citizens," Mr Davis concluded.