AOL Liable For User Content In Germany?
The viewpoint you are missing is called compensation.
The music companies surely have a right for compensation, but this should under no circumstances mean that basic principles of jurisdiction can simply be ignored.
ISPs should not be made liable simply because the content is present on their servers, but only if they can be called guilty. If they immediately shut down this piracy forum after they found out about it, there is no reason, why their actions should be punished with compensation, even though it is harder or even impossible to persecute the people who downloaded the music in this case.