When a sequence of messages by unnamed GUESTS turn up, building on each other in this way, the suspicion that they are really one person playacting to try and stir up trouble is impossible to rule out.

This may of course be untrue in this case. But equally it could be true, in which case it would be a remarkably unpleasant type of destructive manipulation.

I think that our experience with this lind of thing is that to get into arguing about it just feeds it, and that the best thing to do is to turn away from it, and let it wither away.