Would your criteria ban the song "Gloomy Sunday"?
No. Mainly because enforcing a ban on any song requires arranging society in a bad way. Also because I don't consider the mood shift from a depressing song to be much of a harm, and the title is sufficient warning for anyone who wouldn't want to listen to something gloomy. However, my criteria would imply that you should think twice before adding it to your playlist, though, thrice if people subscribe to that playlist who don't want to or ought not to want to listen to it.
Sorry, I should have given a link. I speak of the claims of it inducing suicide.
What I'm saying is that you need actual evidence before invoking claims of harmful sensation.
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.