I know getting a negative rating does not mean you get excluded from DT, im not new here. It just seems counterproductive to have DT members with negative ratings from other DT members. If they can't trust each other why should we?
Decentralization. If you have the DT members agree with one another all the time or have some organized community staying in power, that leads to some heavy corruption. Some people may say that the current system still creates corruption, but there are plenty of objective DT members in the system.
It seems that on mprep case almost no one really wanted to say anything because of fear.
The problem is that without a generalized consensus, most people would be afraid to sent ratings. After all, if someone cared about trust, they would strive to keep it as-is and avoid these kinds of confrontations.