Because we already do that when it's a matter of perjury, filing a false report, defamation, fraud, etc. In all those cases, the government becomes the arbiter

Because we already do that when it's a matter of perjury, filing a false report, defamation, fraud, etc. In all those cases, the government becomes the arbiter of truth. If celebrities can sue the Daily Mail for lying about them and win, why doesn't climate change or covid infectiousness get the same protection, considering the stakes are so much higher?