Specifically going back to the earlier post:
- Witnessing from door-to-door
You are not necessarily an agent of the WTBTS when you participate in these activities. However the group leader may be considered as such, especially if they use the Kingdom Hall or WTBTS instructions (such as the old ‘brown brother’ - reasoning from the scriptures) which is basically a manual on how to do it in a WTBTS-approved way. Hence why they got rid of such associations. Likewise keeping track of return visits on organization-printed official papers, is an organized and sanctioned activity by the WTBTS so in that function you are an agent. However, if you then go and murder a householder, that obviously does not mean that you were doing so as an agent of the WTBTS but the regular day-to-day activity of organizing, leading and keeping track is (or was, since they’ve gotten rid of much of that).
- or using literature trolleys
That’s very clear, the trolleys aren’t purchased by the volunteers because they think it will perform or assist a specific function of their volunteerism (something like a handbag or briefcase would perform that function). They are purchased and stocked by the WTBTS (and/or the local congregation) with a function the WTBTS desires it to have. Given the ownership is not by the volunteer, if the cart were to fall and hurt someone (including but not limited to the volunteer), the congregation and/or WTBTS could be liable. Again, if someone were to shove the cart into an old lady with the purpose to hurt them, that falls outside the WTBTS’ foreseeable use case and liability (unless of course, they instruct the user to do this).
- Writing letters to neighbours
Again, less clear. It all depends on who, how and where. That’s why the WTBTS gives clear instructions that this is voluntary and not sanctioned and gives guidance to make sure that they don’t get involved. But if someone were to say put the Kingdom Hall address on there, or organizes it IN a Kingdom Hall, and it is known and sanctioned or remains uncorrected by the ‘agents’ (elders) despite their full knowledge, that changes the things.
As with the writing activities, it depends on who, how and where. Many parties in JW-land requires sanctioning or chaperoning by the elders and sometimes even higher ups get involved (when it comes to larger/younger parties). At the point it becomes a requirement to have a JW official (in the US, the presiding overseer, secretary and treasurer, but also circuit overseers and others are at the very least corporate agents) present, it becomes a sanctioned activity and part of the WTBTS legal liability.
And yes, the WTBTS will claim and fight to make this otherwise, but these are legal standards with some fuzzy boundaries. In some jurisdictions these borders are clearer than others and in some jurisdictions, liability can be shared between parties. But places like the US, the liability may be (rightfully) inherited solely by association. Hence why becoming an elder is fraught with risks, you are an agent to the organization and share in its culpability.