Speech can be physically dangerous even if it doesn't incite violence. Speaking lies is what got us the Brexit and a certain sentient Orange in the White House. Lies cause physical illnesses in the form of unvaccinated children. Lies give power to corporations that will continue to harm the environment and the people in them. Lies about history will recruit cult members and neo nazis that will hurt other people. Lies are a propaganda tool and will never lead to anything good. Spreading lies on a public platform should damn well be sanctioned because they lead to fucking harm.
You're not really thinking the idea of speech laws through very carefully. Dictating speech is a slippery slope to an authoritarian state. What you know to be fact might be publicly denied by the government. What happens when the government says "No, this was the truth and you are the one spreading lies"? Are you going to tell them they're the liars while they put you in jail?
Speech laws are never a good thing, because if you put the power to determine what is and isn't a lie in the hands of the government, they will abuse it. And no one will even be able to speak out, because they'll be arrested. Speech laws are the fastest way to give up your freedoms.
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