Well my point is that just because someone is libeling you does not make them a scammer.
Maybe not a scammer, but certainly untrustworthy. TS for example, tried for months to damage my credibility with libel. In my mind, that makes him untrustworthy and I left the appropriate trust.
I personally think a better reaction would be to exclude them from your trust network and to ignore their future comments.
While I don't think TECHShARE makes valid points regarding the trust system, I don't think he is a scammer and would trust him with my money. I think giving him negative trust only gives more people an incentive to troll you