What I had in mind was at the moment the newspapers do employ lawyers, and if there's a contentious story about some powerful organisation or some powerful person, the lawyer advises the proprietor whether you can do that. And they won't print if the lawyer says, "You're at serious risk here, you're not going to be able to justify this".
What we don't want is for the ordinary Joe to impose on the journalist the same obligation. If it's Robert Maxwell threatening to sue you, it probably costs quite a lot to work out whether it's worth the candle of persisting with the story. If you have half a dozen people a week alleging that, are you going to hire more lawyers or is the remedy going to be so slight, the process so informal, that the lawyers are not really needed? I'm not sure.