Ian, I'd like to bring up something called "Psychology". People are funny, when something is confusing or obviously misleading, people tend to ignore it. When you come about warning us about him, it brings attention. You just made the possibility that he actually receives contact and actually succeeds in a trade about 100 times more likely.
I disagree. I didn't know that the rogue trader was back, and i feel that the more people are aware of rogue traders, the less likely they will be to do a silly trade.
I'll offer an explanation then. Now, in the real world, people are naturally suspicious of others. Given that we're all long term members, we're suspicious of anyone newer than us, or of lower rank, and it's been proven plenty already through the advent of requirements of reputation to enter contests or trade. So, say in the real world, you have some young upstart offering to sell drugs to others in high school his age. Everyone is already going to be "Psh, right." Well, then we have one fine, outstanding member that everyone respects. Ian, for example. He's out, calling "We've caught the seller, he's the one with the weed!" Well, reputation now. You didn't get rid of him, you pointed him out. People know he really has it now.
Now, how does this transfer into here online? The alternative version is the same as one man calling another horrid and kicking his name in the dirt in the open. People will react the opposite, sympathetic. Most of us older users who know and respect Ian are going to know why he's saying that, and we'll be with him doing the same. However you get the opposite from newer users who might be saying "He's not that bad!" or "You don't have proof!" or something like that. And it WILL come from newer users. All we have in this thread is Ian calling him out with no substance to back it up at the moment, and while I trust him, anyone new to the site won't have reason, and the focal point of their attention will bee on this singled out user. If it doesn't result in a trade it could still result in a friendship, and whatever might have happened because he was ignored is more likely because more people have been brought to attention.
In any case, yes, this IS human psychology and this is an example of how weird and backwards the world can be in the face of obvious traps, it's the reason why scams work so well in the real world already and you can't discount human interaction as a basis that everyone will collectively believe because we're all part of a community. It would have been better to ignore him, keep an eye out and bring him out to Enigmatic_T or one of the other forum moderators, but now all we can do just keep a tighter eye out.