Very simple procedure. Go to Scammer's grave or Private Reports. File a report with sufficient evidence, wait for a MM to resolve it. Going around accusing people is not allowed because little shit heads would go to people they dont like and simply accuse them, and cause them to loose sales/trades.
Proven Scammer = banned. If not banned it is not proven.
If you wanted to help, you simply make a thread in the correct sections. Randomly posting on his profile helps no one, and only got you banned.
Also there is no negative rep anymore. It was removed due to abuse as well.