Only anarchists who think the government is more liberal than voters hate proportional representation

Only people who hate democracy itself hate proportional representation but first past the post is stable because...

It only makes sense to complain about something if it contradicts the agent being good. And if you are on an even level of power and can walk away. It makes no sense to complain about pr and first past the post because the government (being powerful and bad) will not listen to an argument assuming its own tyranny by definition.