If it got to the point that the party was willing to twist the narrative to kill the entire campaign, they should have already left.
Then why are you so passionate about this if you don't have experience? I have experience both as a player when another player goes all murder hobo, and a GM when people have gone full murder hobo. It isn't fun, there was always talk before hand and the GM tries to not break flow of game. I'm not "defense of vindictive DMing" I've just been in plenty of complex situations similar to A NINETEEN WORD MEME that you are refusing to understand that people with experience are laughing at, not because "being mean is good" but people trying to make the best of a shit situation they've been PUT in.
It's a perfect example of what I have been talking about.
DM explains expectations
Player ignores everything
DM does in game thing to enforce expectations
My experience is definitely people wanting to play/GM with friends and I haven't ever directly paid/been pain for sessions. So when I say job I'm definitely implying a soul crushing 9-5 and not a session between friends. It's a group activity, everyone should be trying. If it is solely the DM's job to keep the peace, it is a failing game.