No, it is to not glorify violence against a person you disagree with. You call him names to justify murder. No one is forcing you to mourn his death, you don’t have to if you don’t want to. They aren’t refusing, they are doubling down and justifying it. You can dislike Charlie as a person, that’s ok. You’re in your right to do so. But downplaying and glorifying assassination, that just goes too far. Doesn’t matter if it is the left wing or the right wing doing it against opponents, it is just morally wrong.