I do give people reasonable doubt, however I believe your situation is beyond reasonable doubt. I'm not claiming that you have all accounts either, I proved that you do (unless you want to argue otherwise somehow)

How does one give a negative trust feedback "professionally"?
When he do something wrong. Like he can scam people and you can get full proof against him etc.

You have given negative feedback b/c I have send 18 mertis to a person who have got negative feedback from you recently. If he can still post which I can like I will still given him merits. I don't matter if anyone can mind that.because forum has given me that right.