This should be emblazoned on the top of the trust settings page and the feed back form.

There are a couple of people who's contributions to the forum I find very valuable, and for whom I have respect, but who I've explicitly distrusted (~) from my settings.  It's not personal, it's because I don't value their reviews and their judgment on who's trustworthy and why.  

There are people who I've decided not include in my trust network, even though I value their reviews.  The decision was based on whether I value the people they've included, and why.  It's just a vote being cast, and I want the folks for whom I vote to have a similar approach to the trust network.

It's not personal, it's just the practical nature of the trust system and how it works.  Just because I appreciate you as a forum member doesn't mean I trust your judgement.