In my case I have recently received PMs regarding neutral feedbacks only but have any of you recently received similar PMs asking for either negative or neutral trust to be removed by those that you left them for?
I have never received a PM request for my opinion on a neutral feedback, and as for the negative, I agree with what LoyceV said. It is better to discuss such things publicly, so I always refer to a relevant topic where the defendant can complain if he wants to. I have received PMs from some people asking for my opinion on neutral feedback posts, and I always respond with my thoughts. I do not mind public discussion, but in some cases it is better to avoid any potential conflict by PMing each other directly.
JollyGood, I noticed that you mentioned a particular signature campaign. Could you share publicly which campaign it is about and which members specifically contacted you? It is possible that the signature campaign manager made this a requirement, though I have never seen such requirements before.