If someone comes up to you in the street and makes you an offer that sounds to good to be true, you might not even politely decline (although it would be the mature thing to do) you certainly don't scream "SCAMMM, PONNNZIIIIIII" at the top of your lungs, and even bother to come back to him and insult him, like it happens on the forums.
If someone is knocking on every door in my neighborhood with a utility scam, I would follow him around to my neighbors so I can warn them on the spot. If one has the right to solicit, another the right to anti-solicit. I would also call the police.
Warning people about scams isn't fun but it is civil. However, promoting scams, even if done politely, is extremely ant-civil.
As for baseless accusations, they aren't looking so baseless now are they? There was a strong basis, starting with evidence of absence (not to be confused with absence of evidence), that pirate was a operating a ponzi scam.