the fault is that the system should be left alone and that no changes are needed.
The failed logic is: "The system has issues, therefore it cannot remain!"
Here's some statements for you to dispute:
1) The forum is better off with the current trust system than without.
2) The forum will be worse if the trust system is changed for the worse.
3) The community in general will not refuse a change for the better.
The trust system is the worst form of trust management, except for all those other forms that have been tried from time to time. I challenge you to come up with a system that is a significant improvement over what is in place now. To be judged by the bitcointalk community.