It is much simpler than that: it is to make sure you won't trust any kind of communication anymore. And that in turn will undermine democracy more than anything else. If 99% of the stuff on Facebook, Twitter, Reddit and for all I care HN is nonsense, why would you continue to believe in that 1%? At what ratio do you stop to absorb new, potentially faulty facts simply to protect yourself? The 5G/Coronavirus one is easy to dismiss. For us. For my mom, not so much.