By having zero trading experience (at least from the account he is leaving ratings from), he lacks the experience to be able to reach a middle ground with others, and lacks the ability to show that he has a history of acting reasonable.
1) You're sure they're a sockpuppet
2) You claim they lack experience
To be able to draw that conclusion you must know the owner behind the account and their experience level. Do you? Or are you jumping to conclusions.
In other news, there are no requirements for a position on default trust. Generally, if your feedback is spot on you'll get there. Regardless of any trading history, post/activity count, the number of hairs on your head. Stop imagining rules where there are none.
There is no evidence of any trading experience.
To say that someone should not have trading experience to be in the DefaultTrust network is ridiculous. If they have no experience trading then what would they be doing looking at
marketplace threads where the scams are going to be taking place?
Even by your criteria, the feedback of cryptodevil is not spot on and as a result has no place on DefaultTrust.