Conducting debate by lawsuit is not a very good idea when you believe that the other side is composed of well-funded special interest groups. I mean, its a bad idea for a lot of reasons, but that particular reason is one you should find appealing. If I'm a corporate stooge for SaudiExxoFoxlican Party it is highly likely I can afford to outspend you virtuous protectors of truth on lawyers, and it is highly possible that given a debatable point of fact I could litigate you into penury.