Or was it by The Joker from Batman?

Or was it when protesters in Latin America sat down blocking a road to protest environmental destruction and an American driver was so angry that he was mildly inconvenienced that he got out of his car and murdered one of them with his gun. And Joe Rogan's podcast commentary was "what did they expect?", more annoyed at the inconvenience to drivers than the murder of a human.

Or maybe when Just Stop Oil protestors threw soup and mashed potato on the glass in front of a painting, with the idea "look how angry you are at the damage to a valuable and irreplacable object, this is how angry you should be at the damage to the valuable and irreplacable environment which keeps all humans alive" and Fox News laughed at them for both damaging something important and not causing any real damage so they were ineffective. Then the judge gave them 2 years in prison on the grounds that throwing a can of soup at someone's face would be violence, so throwing it at a painting is violence. But no oil executives overseeing the Exxon Valdez disaster or the Gulf of Mexico disaster faced any jail time at all.

Or when the suffragette movement cut a painting of Venus de Milo to protest against Emmeline Pankhurst being arrested and rough-handled, and people were angrier about the harm to the painting of a woman than about the harm to a real woman.

Or when Fox News says "they aren't protesting the right way" so Kapaernik asked actual verterans how to peacefully protest respectfully and they told him to kneel during the national anthem, and the complainers didn't care a whit and said that was still the wrong way and disrespectable, and he lost his job and the president tweeted rude things about him personally, and the national football thingy made that kind of protest forbidden, almost as if the objection "protesting the wrong way" was all bullshit.

Yes, probably Hannnah Arendt could put it eloquently.

But you're right, murder is wrong, and that's all there is to it.