I think you are focusing on the instances where it is useful and missing the greater and more far reaching/dangerous issues.
I'm focusing on most users, unlike you who are focusing on your particular case.
The system is far from perfect but you're not helping if you just criticize instead of suggesting specific changes to improve it. Of course just removing it completely is not an option as that would cause a lot of scams.
1. The implications for free speech (HUGE)
People can still write whatever they want, with or without the trust system. Users with negative trust (like you) can still post and discuss.
2. The false sense of security and positive or neutral score can render
3. The fact that people should study a persons entire history here before trading not just be lazy and rely on a misleading score.
Yes, ideally. However the truth is most users don't do that, especially newbies. People with positive trust are less likely to scam than people with negative trust. Of course that's not absolute and, ideally, users should still do their homework.
4. The damage to accounts that are not scammers but got red trust via abuse.
5. The incentive and reward to abuse it.
6. The possible benefits of a different policing system
Post you specific suggestions instead of just blindly attacking the system to get rid of your negative trust.
Update: If you ever post suggestions instead of just attacking the system I'll make sure to read. Until then I'll just avoid wasting my time.