Earlier quoted context omitted.
.torrent files make that content available. The simplest counterargument is that if his actions didn't make that content available, what were all the visitors to his site doing? Should a person be able to successfully defend with "What's the problem, I was only giving copies of the vault key to the people who I knew would burgle it. I never handled any of the vault contents myself!"?
Herein lies the problem. While your vault example makes sense, you can also say that someone selling knives or guns can't be responsible for people using them to murder someone else. Where do you draw the line? If you are merely providing something, where is the line where suddenly it's my fault instead of the fault of the user? I think the difference here is that information and objects have an intended purpose - a…
.torrents themselves are perfectly fine, just like knives. I'm not making the argument that the object should be banned. But if a frothing hooligan runs up and asks for your knife because he's going to stab that guy over there, it's pretty clear that if you hand it over you've facilitated a crime.
So it's not the innate nature of the .torrents themselves, but the use of them as a nexus to set people up with illegal content. Like being a middleman selling stolen property, perhaps. You didn't steal it, but you did make it available.