Yes, it's like book burning. It makes the banned content more enticing. This is the big issue with New Zealand banning the recent shooters manifesto. What if news organizations want to read it to report on it (even if it is just to say, this is why he's a nutjob)? Banning his manifesto grants it more important. It shows the government is afraid of it for some reason.
Mein Kampf is still available for purchase in NZ. I've personally looked through his manifesto and think it should be discussed in schools, so students and teachers can explore his breaks in logic and contradictory statements. If you understand people like that, maybe you can identify them early on, or encourage attitudes in general that would prevent those xenophobic ideas from developing.
Copycat violence is a thing, when you offer people to make a political statement and then get immortalized, history has proven that people will take you up on that.
Secondly regarding the most recent NZ manifesto, it isn't a well argued thesis as much as a dump of memes and shitposting.
Mein Kampf is still available for purchase in NZ. I've personally looked through his manifesto and think it should be discussed in schools, so students and teachers can explore his breaks in logic and contradictory statements. If you understand people like that, maybe you can identify them early on, or encourage attitudes in general that would prevent those xenophobic ideas from developing.