Of course you only get an "Abmahnung" if you use it for copyright violations. But that is by far the largest use case. It can hardly be ignored that most people, especially "non-technical" ones, associate BitTorrent only with illegally downloading media.
What I wanted to say, is that now - as opposed to a few years ago - the probability of getting into trouble when downloading popular episodes via bittorrent has approached ~1.
My point was basically, the old approach of Joe Average Pirate of 1) installing µTorrent and 2) googling for "Big Bang Theory S05E01 torrent" is as good as dead.
You're right I was a bit sloppy, but that's moot now since I can't edit my post anymore and will probably continue to be downvoted until the text is completely invisible :-(
Now of course, you can make it difficult to join the torrents - for example, by using private trackers - but that makes it as difficult for me as for the hollywood copyright holders.
Then just IP address -> Court order -> ISP -> Your home address and send the threatening letter.
That's absolutely not true. You can use BitTorrent as much as you like, there is absolutely no danger in doing so. If you commit copyright violations however, you might get caught regardless of how you did it.