You should think of miners as bodyguards. They aren't intended to be active participants on the network, they are intended to provide the service of securing the network and serving the interests of the users of the network.
If a group of bodyguards at a concert vote democratically and 51% of them decide the singer shouldn't be allowed to go on stage and sing (because of a grudge or whatever), is that a problem? Yes absolutely that's a problem, and probably all of them are going to get fired.
Same sort of idea here. If the miners aren't serving the best interests of the network, the network has no obligation to continue paying the miners tens of millions of dollars per day (no joke, that's how much miners on Ethereum make in revenue right now) to continue sticking around.
If a group of bodyguards at a concert vote democratically and 51% of them decide the singer shouldn't be allowed to go on stage and sing (because of a grudge or whatever), is that a problem? Yes absolutely that's a problem, and probably all of them are going to get fired.
Same sort of idea here. If the miners aren't serving the best interests of the network, the network has no obligation to continue paying the miners tens of millions of dollars per day (no joke, that's how much miners on Ethereum make in revenue right now) to continue sticking around.