Is this a centralized or decentralized system? I am not allowed to give a negative tag to people who I don't trust? Who do I tag instead because of this spammer, the manager that enables this user to defraud the company that is funding the signature campaign?
If you do not trust someone,
Go to your profile, and then click on trust >> Trust settings >> Put a ~ and their username. In this case, it would be ~Bitcoin Smith and update it. If you trust some, do the same process, but without a ~. That's how you do it.
You should read the beginner's guide, which was mentioned by Bitcoin Smith earlier.
That thread does not help, these statements are contradictory.
Trust feedback
Trust feedback (Positive/Neutral/Negative) can be used to express your opinion about someone's trustworthiness. In other words: would you trust or have you trusted this user with your money?
Of course I would not trust the author of this thread with anything. This part of the thread indicates that negative trust is appropriate, other parts of that thread and statements by other members here indicate the contrary. So which one is it? Are you able to decide what constitutes trustworthiness yourself or do you obey a preset list of rules that are imposed by others?