It’s gotta be killing an mc player’s dog.
If you upvote an upvote beggar’s meme and persuade others to, then that’s great. Because not only the beggar would be very happy to get internet points and upvotes on his meme, the person who persuades and the people who upvote the meme is happy and no one has to suffer. But if you kill an mc player’s dog, then you basically just killed their only reason to live since the dog was very loyal to the player. And you only get a short burst of non-ethical happiness if you killed an mc player’s dog but what did you get out of it in the long term? Nothing. Exactly.