As a newbie and someone who want to be comfortable in this forum, I observed that they're certain things that deserves attention from mods and administrators.
Since trust system is not moderated, there is nothing that mods and administrators can do, even if you prove (which you btw didn't do) that Jollygood abused trust system. The only ones that can do something about are DT members, if enough of them exclude him from their trust list. I suggest you to check how trust system actually works before creating similar threads.
How can you delete posts and still put it on the reference section? How do you want others to check your assertion? Where is the justice?
You are right here, he should have archived the posts he used as a reference for a feedback.
So tagging someone's account with neutral seems like a good compliment to you right? It's a defamation of account and that's a bad reputation to the affected users. No one will care if they really produce low quality posts as he claimed.
Neutrals are used so all sort of things and I don't think that one neutral feedback will prevent someone from joining the campaign if he is a decent poster. On top of that, a lot of members around here know that Jollygood is tends to be easy on negative feedbacks so I don't think that it has as much weight as you might think.