That would require a central repository of "actual facts". Even if there was one and everyone agreed on every entry, there would still be the issue that a vast

That would require a central repository of "actual facts". Even if there was one and everyone agreed on every entry, there would still be the issue that a vast majority of political speech is opinionated interpretation of a selected group of facts. Fool-proof automatic fact checking might be nice, but it wouldn't solve the problems inherent in the current state of political discourse.