Agreed about defamation suit by corporations. It's usually a waste of money to sue individuals for defamation on message boards.
If anonymous JPP asshole #1 calls anonymous JPP asshole #2 a "cunt", there's a zero chance of proving defamation since a key part of defamation is proving harm. Corporations can prove harm by loss of business. What harm was done to an anonymous user?
Another reason I don't like lawyers, but understand their use was because I was involved in such a lawsuit. It cost me $17K to tell that asshole to go fuck himself. The good news? He spent over $89K before his lawyers quit for non-payment and then represented himself in court.
Also, it might be hard to prove JPP Asshole #2 is not a cunt. On the other hand, Dominion and Smartmatic can prove Hugo Chavez did not write their software and all the other claims made about those two corporations.