They are there to play the game, same as all of us.
Once they are pulling a childish "I can do whatever I want!" and refusing to play, at that point then they aren't there anymore, they are asked to leave and not come back until they can behave like adults, and their characters become NPCs under my control.
I have been on the opposite side of the screen and walked out on a jerkass DM to, but I was never under any illusion that the game wouldn't go on in my absence or that I have even a modicum of creative input over the fate of my character after I have left the group.
I don't agree. Generally, your character is there for the scenario the GM wants to run, or they aren't.
For example; in the long running Mage: The Ascension game I was part of, we spent the better part of a year in the spirit world on a time traveling journey. I, personally, would have much rather stayed in the real world as my character had a lot of ties to mundane civilization, but I was never given that choice. The Game Master wanted to run a game in the mythic past, the other players were down with it, so my choices were to make the best of it, or simply stay home and hope there was still a seat for me at the table in the next arc. I chose to continue playing, because even though it wasn't my preferred setting, it was still a good game and the choice was that or don't play at all.
IMO, it would have been the height of entitled rudeness to tell the GM that he needed to torch the story arc that he obviously put a ton of time and effort into because it wasn't my favorite.
If the Game Master had wanted to run a jail break scenario instead of a spirit quest scenario, I don't think things would have changed at all from a social dynamic.
So, out of curiosity, you don't expect your players to keep in character or try and succeed at their goals?
Because the idea that a character shouldn't care about survival is just so alien to me...
Like, you wouldn't bat an eyelid if half way through the dungeon one of your players got bored and instead of playing a Conan type guy started acting like Bugs Bunny and throwing pies at dragons and tying his companions shoe laces together during a tense standoff with the dark lord?