This sounds like a nice, but dangerous idea: who decides what the truth is? Obviously some statements are blatantly false (2 + 2 = 5), but those don't need to b

This sounds like a nice, but dangerous idea: who decides what the truth is? Obviously some statements are blatantly false (2 + 2 = 5), but those don't need to be forbidden by a law: just ignore it, or laugh at it, and let the paper editing this lose its readership (or reduce it to the community of 2+2=5- believers). The actual matter is for controversial statements. I very much prefer those statements to be allowed, discussed, debunked if needed, than outright forbidden. In liberal democracies, the press is generally considered to be a needed counterpower (along with the establish executive, legislative and judicial powers of the state). Putting it under the control of the judicial power kind of weakens it.