Ok, so if one is guilty of transmitting or carrying illegal content merely through providing the medium of transmission, wouldn't that mean the ISPs involved, a

Ok, so if one is guilty of transmitting or carrying illegal content merely through providing the medium of transmission, wouldn't that mean the ISPs involved, and the owners of the telephone cables, are just as guilty? Wouldn't any postman, and for example the USPS, be guilty if a private individual posted something illegal?