If the UK's notion of libel were applied to the scenario of the article, Robert Frese would be required to prove that his statements were truthful, rather than the police/prosecution proving Robert knew he was lying. That's obscene.
Think about how hard each of those would be to prove. To prove he knew he was lying would almost require that he admitted it in writing or was recorded admitting it. But for a man like Robert Frese to prove that the police were dirty would be almost impossible, the FBI often has difficulty proving that crooked cops are crooked, and they have a lot more resources than just some guy who trash-talked the police. Requiring Robert Frese to prove himself correct is totally unreasonable. Requiring the prosecution to prove Robert Frese knew he was lying is the only semi-sane approach to criminal libel (the criminality of libel is dubious in the first place.)
If you want stronger libel laws to hold corporations accountable, you need to first stop treating corporations and individuals as the same. Applying the same standard to both will create a situation where either corporations are relatively free to say anything, or create a situation where individuals are crushed under the force of laws designed to be forceful enough to beat corporations into compliance. But until that separation happens, having laws that protect people like Robert Frese is the sane default.