I still feel that you gave a negative trust just based on "assumptions", cuz it has happened before so it will happen again, and as a "trusted" guy hasn't scammed before, so he wont scam in the future. I just feel the neg trust should have been converted to a neutral one(negative is too harsh cuz u gave it based on ASUMPTIONS), and so because of your assumptions, making an account bleed with red trust, is too harsh! I sincerely feel that it could have been a neutral one. If someone has to get scammed he will even get scammed after seeing a red trust, this is just because people tend to ignore the trust ratings because of the way neg. trust gets distributed by other members. The credibility of neg. trust has been reduced a lot and cases like this are making the red trust loose its importance.

I feel the case was more like : The op felt he is trusted, statistically he's untrusted, he offered escrow, hilarious took the offensive approach to defence the community, hilarious gave him a negative trust.
Could have been neutral imo.