Trust rating is no longer only related to trading. I've put negative feedback on users trying out various scams, I've put negative feedback for impersonating, for automated translations... but far too few over time, I know.
But I think that this is DT about: highly active users that put negative feedback on wrong doers. Of course, the DT members have to be highly trusted, since negative feedback leads sooner or later to various sorts of questions and also retaliation.