He's not a victim, there was no crime. Several of the Default Trust folks I've seen are more proactive in their ratings on purpose. After the April peak but before the ratings system, we had scammers all over the place. A year ago one of them was even named something like "Baron von Scam" talking about 20% returns in a week's time and people sent him coin. In late 2012, someone started a joke Pirate account (after the pirateat40 ponzi scheme) and still got something like 40 BTC worth of coin. In Summer 2012, a 19 year old Ukranian-American from New Jersey created an account on here pretending to be "Homeless Jackie" and posted pictures of a college girl who stayed over for summer break and slept on his couch and did drugs with him.
Unfortunately, even with such blatant and obvious scam intent, people are still dumb. I'd rather see some of those guys in DefaultTrust go overboard with their ratings and reconsider them later on than sit inactive. That said, I myself won't rate people unless I've done business with or doxxed their scam directly.