Obviously all available tools will by used by bad people. What we need is:

1) Good people to also use those tools - a lot of self-proclaimed good people think some tools are bad and therefore they won't use them. But tools are just tools, what makes it good or bad is who you use it against / for what reason.

A simple example is killing. Many people will have a knee-jerk reaction and say it's always bad. And they you start asking them questions and they begrudgingly admit that it's OK in self defense. And then you ask more questions and you come up a bunch of examples where logically it's the right tool to use but it's outside of the Overton window for them to admit it.

A good way to reveal people's true morality is movies. People will cheer for the good guys taking revenge, killing a rapist, overthrowing a corrupt government, etc. Because they naturally understand those things to be right, they've just been conditioned to not say it.

2) When bad people hurt someone using a tool, we need the tool to backfire when caught.

Obviously, to jail someone, the lying needs to be proven "beyond reasonable doubt" - i.e. Blackstone's ratio. Oh and no government appointed experts who get to dictate the truth. If the truth is not known with sufficient certainty, then neither side can be punished.

This threshold should be sufficient so that if it later turns out the person was not in fact lying, the trial is reevaluated and it will show that the prosecution manipulated evidence to manipulate the judge into believing the evidence was sufficient.

Alternatively, since incentives dictate how people play the game, we can decide that 10:1 is an acceptable error ratio and automatically punish prosecutors who have an error rate higher than that and jail them for the excess time.

So yes, if A jails B and it later turns out this was done through either sufficient incompetence or malice, then A should face the same punishment.

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I am sure given more time, we can come up with less "naive" and more reliable systems. What we know for sure is that the current system is not working - polarization is rising, anti-social disorders are more common, inequality is rising, censorship in the west increased massively in the last few years, etc.

So either we come up with ways to reverse the trend or it will keep getting worse until it reaches some threshold above which society will rapidly and violently change (either more countries fall into authoritarianism or civil war erupts, neither of which is desirable).

You do realize laws like this already exist in America? Slander and defamation are laws against lying

I fully support banning politics and the media from lying because they should be held to a higher standard