Why? You're not having fun playing that game. What you want to do won't be fun for everyone else. You didn't like the game to begin with, so there's no point in giving it a satisfying conclusion. There are better things you could do, like setting up a game you'd prefer. Why waste your time playing that last session?
If the DM leaves the players are dead anyway. Might as well do it with a bang.
Why? You're not having fun playing that game. What you want to do won't be fun for everyone else. You didn't like the game to begin with, so there's no point in giving it a satisfying conclusion. There are better things you could do, like setting up a game you'd prefer. Why waste your time playing that last session?
Generally the frustration builds in that session. You don't decide it will be the last session beforehand.
Then why do you need to finish the session? Just quit on the spot and see what you can make of the rest of your evening.
A TPK is a pretty quick way to end the session.
And some people need to have their stories complete.
I'm the kinda guy that stopped watching a 12 episode series on episode 11. I don't regret it. It wasn't a story worth completing.