I wouldn't say its broken as we have the Reputation board ( and Scam accusation) to talk about the negative trust that has been given to you. I have been hanging out on those threads for a while now and to tell you the truth a lot of negative trust that has been given wrongly to members has been either removed or changed to neutral. Mostly misunderstandings as well as the problem being fixed is the most common way you get your negative trust be removed in your trust summary.