Each casino have their own way to solve the complaint, in this matter Trustdice tend to choose to solve the case with third party as the mediator. Because when someone create an accusation thread in this forum, it's always words vs words. Almost of the accuser don't want to being honest if they're cheating or abusing the casino, they only want to find the loophole to make more money.
I don't see any reason for not trusting Trustdice.