@tsarstepan,
The only form of ethical bit torrent is downloading open source software, or books/ movies/ music where there is no copyright or the copyright is expired.
What is described in the cartoon is not ethical, legally speaking.
Does that mean people don't break the rules? No, almost everyone I know when attending college will just cross their fingers and hope they don't get a letter of warning from their internet provider.
I personally saved money (more than a couple of thousand $) on buying books, from torrenting almost all of the expensive textbook pdf files from the different available torrents. (My excuse was I was broke and in debt, although I doubt lawyers will take that excuse in court....)
Bit torrent was originally invented for Linux distributions, because it's the cheapest way to transfer huge files.
Currently, my main use of bit torrent is to get new genuine distributions of Red Hat.
From time to time I torrent books (If I like it I'll buy it and add it to my library collection... so the author has something on his/her table to eat), but I stay away from movies and music, because such businesses have the money to sniff you out.
It's one of those gray border lines where if you're caught you get slapped in the hand first, second time though, if you don't heed the warning, you'll be crushed by the corporate lawyers.