There is no way to influence your trust, the system is not regulated and a red trust can only be removed by the one who left it, however you can draw light to obvious abuse of the trust system, if you have a strong case such member can get excluded from DT and their feedback (positive or negative) would not count.

As suggested, this thread would be more appropriate in the reputation board. You can find the option to move it at the bottom right side of this thread.