The question is more about when a trade isn't involved. I described it above. Does a non-trade scenario of a liar that involves other users, which is proven, warrant a negative trust? Let's say it's not an opinion, a user is misrepresenting facts etc. Negative warranted?
No.
If it has nothing to do with a person's ability to conduct a trade on-forum then it should be left out of the trust system. Over the years, "trade" has been expanded to include participation in bounties, signature campaigns and any kind of agreement that involves an exchange of goods or services for BTC, other crypto, or money.
Some things negative trusts should never be used for include:
- airing personal grievances
- calling someone a troll
- calling someone a liar outside of anything related to trade
Neutral trust should be used when commenting on someone's ability to use the trust system correctly.
Like LoyceV said in the other thread, no one can stop you from leaving any kind of trust you want, but in doing so you can't expect other people to agree with your interpretation of appropriate use of the trust system.