I wasn't aware that you are familiar with the laws of all of the states in the US, as well as Puerto Rico, Guam, etc. The ability of a average, non-police powered person to arrest another person is actually fairly limited and is governed by state, not federal, law. So there is no uniform USA-wide rule. Secondly, as far as I am aware, being licensed in California, you may only arrest someone for a felony if you witness, in person, them committing said felony. Being aware of the felony is not sufficient. And, if you are wrong or if the authorities choose not to prosecute, which they may do for a multitude of reasons, the biggest one being a lack of unlimited resources, you may be personally liable in civil court for your arrest. Additionally, to the extent that a person has the right to arrest another person for a crime witnessed, you don't need to be a citizen. You could be an illegal, undocumented alien (or ELE for that matter).
Second, the allegations of fraud in the civil court are not evidence, in the legal sense, in or of anything. Nothing that was filed in the RvD case would become evidence, in that case, until it was admitted into evidence by the judge during the trial. The various affidavits and statements made during depositions might be admitted in other cases or in a criminal trial because (1) they were made under oath and/or (2) they are statements by a party opponent (in the other case) but at this point they are not "evidence" in a legal proceeding.
Third, I can continue calling Rossi a fraud, a cheat, a liar, a hypocrite, etc. with complete criminal immunity and I don't have to do or prove anything, unless he sues me in CIVIL court. There is no crime committed by me here, even if I was lying (I am not saying that all such statements would never end up with criminal sanctions - for example, if I publicly disseminated false information about a publicly traded company in order to drive down its share price so I could short sell or buy on the cheap, I could possibly be prosecuted, as a criminal matter if I had used the postal service or telephone laws as violating the mail fraud statutes - which actually is a fairly regularly charged federal crime). Rossi's only potential remedy against me would be to sue in tort and I so hope he does. After all, truth is an absolute defense, even if I intended my statements to injure his reputation. And he has admitted, under oath, that he has lied, cheated, defrauded, etc., or made statements that would making proving that easy. E.g., "I had nothing to do with JMP", oops I owned and controlled it.
Lastly, your statements that we have proof that Rossi is not a fraud because there was a settlement is a logical non-sequitur. The first does not imply or prove the second, just as the absence of evidence of something does not prove that said something does not exist, it merely means that at this time we don't have evidence of that something. As to Rossi being everything I claim, although evidence has not been admitted in a legal proceeding "yet," I can only that Rossi sues me so that I can have an opportunity to get it admitted at a trial.
Please Rossi, sue me. I am bored and need some excitement.
PS: As others have noted, in the grand scheme of things, just as I said that RvD was not a hugely complicated case, Rossi's fraud is not really high on any state law enforcement office's radar or concerns. They have limited resources and serious crimes, e.g., violent crimes, take priority. As to the Feds, the only one that will care is the IRS. Fuck with them at your own risk.
It would appear we share the same hope, that Rossi would sue you. It's not as outlandish as some might think, because Rossi was moving forward on a libel suit against Wikipedia as soon as he got a little extra money in his pocket.
I would look forward to seeing your defense. Your lackluster legal performance reflected on this blog (where you said you were going to ignore me) is evidence Rossi would prevail. For instance when I say you can citizen-arrest someone when you see them commit a crime your response is that you have to see them commit a crime. That kind of bullshit response will lead to you having your ass handed to you in court. Best of luck.