You may want to show look at this case
In November 1997, a U.S. appeals court ruled 3–0 that Hit Man was not
protected by the free speech/free press clause of the First Amendment
and thus Paladin Enterprises could be held liable for a triple murder
committed by one of its readers.
On May 21, 1999, Paladin Press' insurance company agreed to settle the
case out-of-court, against the wishes of Paladin Press themselves, who
were confident that they would prevail in court; however, Paladin’s
insurance company balked at going to court again, figuring expenses
for a lengthy trial in federal court, plus the posting of a bond in
case they lost and appealed, would have cost much more than the
settlement. Under this settlement, Paladin's insurance policy paid
several million dollars to the families of those killed by the
murderer, while also agreeing to destroy the remaining 700 copies of
the book in their possession and surrendering any rights they had to
publish and reproduce the work. Jon Ford, Paladin’s editorial
director, called the settlement "economic censorship."
While there are some uncertainties, the idea is that US appeals ruled 3-0 that describing how to murder people is not protected by first amendment.
That is the only case I've heard of this kind.
- It is still not a crime (it's a civil case)
- The book goes very far. It tells how to actually murder people
- No body goes to jail. However it's liable.
How im the earth this is relevant to the question is a bit beyond me. I am not a lawyer. Comments are welcome
My guesses now is
It's still legal in a sense that it's not criminal
It's a tort
So if you write something about how to kill people, you should do so anonymously. Use steemit or trx crypto coins to collect money from what you do.
Just kidding... Even they will screw you out. But truly free freedom of speech belong on crypto currency and dark web I think.