Just look at the 'good faith' allowances granted when government officials violate the legal system's own laws and requirements. Not only is it ineffective if someone is good at lying, it just voids it's own laws and requirements if the liar is a government official because 'good faith'.

And doesn't keep/already destroyed records, per Jan 6th investigation.

You can impeach someone and/or offer up other witnesses to chip away at a liar's credibility. "Good enough" doesn't come close to describing the level of deception necessary to render our entire legal system completely ineffective.

The legal system fails in cases such as https://news.ycombinator.com/item?id=30838149, with motivated convincing liars and/or corruption. Is there a better alternative?

Which is pretty much the job definition of an actor...