Even the "series of tubes" thing can easily explain this.
Should the water company be liable if say, some serial killer uses their tubes to drown his victims?
Should the electricity provider be liable for powering the computers that ran the servers?
These aren't new legal questions or anything - pretty common to come across them in law school. Ianal but I've taken some basic classes and even I've seen them!
The rulings, instead, are a consequence of the personal interest and personal ideology of the jurist. We need to collectively create something better then the assumed good faith enlightened monarchies that we call the court systems.
The results they produce seem to have chronic problems