There is no one good excuse for a torrent site to even exist EXCEPT FOR THE PROLIFERATION OF THEFT... Period.
What these companies need to do, or somebody START a company, that first targets the ISP or the offending user or both. Send their info to the local law enforcement and go pick them up, get a warrant, etc. I mean you can't walk into walmart and walk out without a cd without paying and NOT expect to get arrested.
interesting point is ever technological advancement that increased copyright holders income was called theft/piracy at first.
from the printing press, to the vcr, to dvd recorder, to cable television.