This is called censoring. When censorship happens, a social and cultural backlash occurs. This decision by New Zealand booksellers will have the opposite reaction of what the government is trying to do. I detest U.S. rap and hip-hop because of their lyrical content that promotes violence and misogyny but I do not advocate banning that music. Because once that starts, where does it end? Oh yeah, banning Dolly Porton songs...

Jordan Peterson's popular 12 Rules book banned by New Zealand booksellers because of Christchurch mosque massacre
[nationalpost.com]