This has nothing to do with "voicing an opinion".
He spread hatred, hatred for feminists, hatred for trans people, hatred for anything that reeked left-wing. And hatred isn't an opinion. We're just giving back what he gave the world. You call that celebrating the murder of a person, but didn't he call for the bailing out of another murderer and called that act "patriotic"? He and his wife are reaping what they sowed.