The Royal Commission of Inquiry has revealed the gunman in the 2019 Christchurch terror attack donated to prominent far-right YouTuber Stefan Molyneux.
The Government publicly released the findings on Tuesday afternoon of the extensive investigation into what could have prevented the attack.
"This book should be a holy book for the sake of New Zealand people and for their safety," said Janna Ezat, whose son Hussein Al-Umari was one of the 51 people killed.
"It shouldn't be put on the shelf, it's a holy book."
The report found the terrorist's "thinking was affected by what was said in far-right online communities and other far-right material he found on the internet".
This material includes some from Canadian Youtuber Stefan Molyneux, who is notorious for propagating debunked pseudo-science about non-white people being genetically inferior, along with making countless comments considered Islamophobic, misogynistic and transphobic.
Molyneux tried unsuccessfully to speak to New Zealand audiences two years ago along with other alt-right YouTuber Lauren Southern.
The report revealed the Christchurch terrorist had donated $138.89 to a podcast and YouTube channel by Molyneux, which raised concerns for victims.
"The terrorist misused the social media in a bad way so it's affected us directly," Ezat told Newshub.
The terrorist also donated money to white supremacists around the world and openly posted on their Facebook pages.
One post reads: "Across the road from my [Dunedin] gym is an Islamic boarding school. To date, I have been using it as a source of rage for my [weight]lifts."
The terrorist's brazen attitude has frustrating victims like Maha Elmandani who lost her father during the mosque attacks.
"His success was that he was able to work within the system and he did nothing that was illegal for the most part," she said.
His use of the internet has also prompting fear from Sara Qasem, who lost her father too.
"As a high school teacher I know well and good that the internet is such an influential tool and to young minds. Although it can start off as a joke and as something that you just do for a laugh and don't take too seriously, that can develop into true ways of thinking," she said.
But the terrorist's unusual behaviour wasn't just online. He travelled right around the world, including to many terrorism hotspots, in the lead up to the attack. But it drew no red flags.
The Royal Commission also found he was abusing steroids.
Doctors found him "moon-faced" and puffy from steroid overuse, he had injected testosterone and purchased 500 hypodermic needles.
The report also said he had written a "to-do list" before the attack, reminding himself to make Facebook posts such as: "One like and I will burn down a Mosque".
It came before he set himself the final task: "15th March is go rain or shine."