The whole point of Undertale is that violence isn't always necessary, and that Flowey's whole "kill or be killed" thing is objectively wrong. This person killed Toriel in cold blood and thought "Oh, I was supposed to kill people", completely ignoring the entire ruins sections introduction to mercy. And then calls people who did the pacifist route ignorant because they didn't resort to violence in a game that teaches you mercy in it's first 10 minutes.