So he wasn't directing anybody to commit a crime? It's a deplorable scenario, but free exchange of ideas and beliefs still requires protection. The consequences of losing it are in the long-term far greater than personal grief.
He flat out lied about the Sandy Hook massacre and slandered victims of murder. He absolutely encouraged people to "take action on their own by looking into it". You can't claim satire on flat out repeated lies. Lies are not protected speech. This wasn't about the free exchange of ideas, this isn't a disagreement on policy, it was about propogating lies to people in order to make money.
What evidence do you have that he knowingly stated that falsehood at the time of saying it?