It's not even a rounding error in our national murder rate. We are currently at over 20,000 murders per year in the US, and it's rare for more than a handful to be linked to white identity extremism in a given year. The real "threat" was that a bunch of IC employees would end up redundant after ISIS imploded. There are an awful lot of highly paid IC employees and consultants who hopped on the new counterterrorism bandwagon after their old cash cow dried up.

Besides that, even if it were a real threat, censoring speech is not the solution. I'm not sure if you have read the Christchurch manifesto, but it's garbage. Seriously NZ is doing the author a favor by censoring it. That way he gets to play the political persecution card and people are less likely to actually read it.