Scammers are not banned. You need to learn to take the appropriate precautions to prevent yourself from getting scammed.
Even if you present sufficient evidence that you were scammed the administration is not going to decide what is a scam and what is not a scam
This rule is just utterly weird for me to understand, if you prove that someone cheated, robbed and scammed you forum staff should ban him immediately. Seeing how you can be banned for posting off topic replies more likely than when you stole coins from people is just, well... hard to accept.
This is, first and foremost, a discussion forum. Banning someone for breaking a law/contract/agreement is unnecessary, especially when we have the feedback system. People are capable of making up their own minds on who to trade with as long as they have all the information. Breaking a law doesn't mean you don't have anything to contribute.
All that aside, nobody wants to take the amount of time it would take to personally verify every instance of scamming beyond a reasonable doubt. Do you have hours to kill every day, for nothing in return besides a "Thanks!" or "Fuck you!". Or just let people decide for themselves?