but if merit is abused, there is nothing bad to give such accounts that abused merit to be given red trust.
I don't think so. I have done that in my newbie days and I learned some lessons from there. You should not give anyone negative feedback if someone abuses merit.
allow me to quote theymos:
If a DT member tags you for something stupid involving merit (ie. probably anything less than selling merit), then they're not going to be a DT member for much longer.
He was talking to a DT about Merit abuse.
About giving Trust system. Allow me to quote Theymos again:
The system is for handling trade risk, not for flagging people for good/bad posts/personalities/ideas.
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- Leave negative ratings if you actively think that trading with the person is less safe than with a random person.