I really think DT system should be used to prevent people from scamming (or make it a little more difficult at least).
If we leave negative trust to shitposters I think people can end up ignoring the feedback left to scammers/untrustworthy users.
Actually, this was one of the things I was thinking about after the addition to DefaultTrust. A sort of 'dilution' in terms of the impact of red trust. Though I agree to a certain point that tagging should be reserved for scammers (and particularly bad spammers) I believe that there has to be something to properly act as a deterrent to spam.
Perhaps we should discuss this and come to a compromise.
Maybe leaving a neutral to users with extreme poor post quality would help? I guess signature managers would have to place some rules about those neutrals besides the current negative ones.
Perhaps, but a neutral feedback is going to be overlooked far more than a negative one.