Strongly agree with this. If you truly believe that a piece of text is harmful to those who read it, then you should also believe that it is immoral (under utilitarianism) to spread it to people who might be vulnerable.
My position is that nihilism is dangerous, but only to those who are stuck on the idea of a universal utility function, and don't have a personal utility function (or the idea of a personal utility function) to fill in the void when that idea is shown to be unworkable. So it certainly can be read safely, but there are non-optional prerequisites for safe handling. You should be careful about posting anything more about this until you're confident that you understand what those prerequisites are, and have written introductory text that fulfills them.
The trouble is that a rationalism that fails to deal with possible basilisks ... fails.
We don't all have an impregnable mental fortress. (And anyone claiming they do is speaking foolishly - they might do, but they can't possibly be certain.) But a failure to be able to deal with such is, nevertheless, a failure of rationality.
So let's do something useful. How do we train a rationalist to safely outstare a basilisk and turn Medusa to stone?
My various interweb browsings stumbled me upon a potential Cockatrice in written, philisophical form. I've thus far read through the first chapter, and it is less anti-rational than most philosophical writings.
I'm reading through it right now, and will provide my feedback when I'm done, likely as a front-page post.
Personally, I'm a Fatalist, with some sort of Weird Soldier Ethic, who plans to go out the same way that Hunter did (if the cops don't get me first), but I've got a bunch of nonsense to Write first. I figure that'll make me somewhat immune. That aside, I doubt it's a real cockatrice - or we would've heard about it before.
It is a strong exercise in Nihilism. So, with those cautions given, I offer it to you: an extensive suicide letter.
Tip of the hat to this guy.