The first thing any newbie should do is remove "DefaultTrust" from their trust list. Why it is in there in the first place is a matter of speculation, but the fact is, a good portion of the people in "DefaultTrust" can't be trusted nor should you trust them, since you don't know them.
Remove everyone from your trust list and start building your own trust list of people you actually trust. Don't trust the site op and moderators, they are not here to help you or protect you from scammers or anything like that... that is your job. Don't blindly trust, remove DefaultTrust
Now how exactly is a newbie suppose to know who he can and cannot trust to give proper trust ratings? I think it is safe to say that you are giving very bad advice
Bad advice? So you think blindly trusting people who use the trust system as a weapon and a trust system that has built in scammers is somehow better than not trusting anyone be default? You are whack, man. A newbie is suppose to know who to trust by doing dealings with people and building up that trust network. Relying on AnonymousInternetUser to tell you who to trust and who not to trust is the very definition of insanity, especially when that very same user has repeatedly told newbies to trust known scammers.
It's very, very bad advice to tell a newbie that they can trust someone when that person has not earned any of that trust.