How not to respond to negative claims online

Some obscure accounting software company called 2Clix is suing Whirlpool for comments made in its forums. I suspect their problem is that a search for 2Clix gets lots of threads Statement of Claim, I'm even more convinced this company has taken exactly the wrong approach. Reading between the lines they're claiming that the supposedly false statements in the threads were made by a malicious third party, like a competitior or disgruntled ex-employee. If they really want to make this claim, they're going after the wrong person. What they should have done is attempted to find the identity of the posters, filing a subpoena against Whirlpool to get IP addresses and the like. But it sounds like they're either stupid or very badly advised.