It is true that the OP was negligent, but it is more than evident that he did not know how to check someone's trust - because in the case of this scammer all you see is a number that has -5 in the end, which means nothing to many beginners. The previous trust system at least gave a warning that it was risky to trade with someone as soon as he had one negative feedback from one DT member, and now there obviously needs to be many more for such a warning to be displayed.

I hope that some more DT members will support the flag which will show a red warning above the scammer thread.