story
https://qz.com/1579660/new-zealands-manifesto-ban-explained-...
According to that article, having a copy is worth 10 years in the pokey.
It also falls under the US supreme court test for obscenity and is equally illegal in the US
I don't think that's correct.
There are no federal obscenity laws. The U.S. government does not expressly prohibit obscene conduct. In fact, the U.S. government expressly protects some communications in the First Amendment to the U.S. Constitution.
Ignoring the state law requirement (which you haven't cited), the video does not depict sexual conduct.. and there's no way you can twist this into being illegal in the US. It's not illegal. Period. ISIS videos aren't illegal either.
You've clearly misunderstood our laws.
I fail to see how a shooting video appeals to the prurient interest in any way.