Seems like it should be TRIVIAL; (if backed up by legal authority of governments - and that's the REAL trick) - to cause all claims to be properly categorized.

Either something is OPINION, or it's FACT. And anything that is Factual, could have the privilege to be labeled as such. Things that are proven not-true or misinformation, or unsupported - they could be permanently labelled "bullshit" and why the hell can't we do this?

Because people will skirt the system. Unless we have a government that supports rule of law.