Yeah, I'm aware that that last sentence isn't in the Bible, it's a quote from King Louis IX. But I think you'll find that if you take Jesus by his word and try to argue with or convince these people, you'll quickly find that an awful lot of them are long past being able to be saved. They've sold their souls to the devil a long time ago and have little to no humanity left. They're demons and ghouls, and they'd be better off dead, because at least then that would end their suffering.