@dozy is right.
Notice it says offence and not sin etc, and the area that this falls under is https://en.wikipedia.org/wiki/Vicarious_liability where as far as common law is concerned the Watchtower and BT Sociciety would be considered by any reasonable court and certainly by any section 73 court liable for the actions of anyone of these "special" people.
I remember just over a year ago chatting to someone in the service department and asking them "don't you know what it means that they are special" to which there was stunned silence. Maybe the tools have learned?