Not only the left-right axis is important

The false assumption of fptp is that only the left-right axis is important.

And this applies whether or not you are in favour of government. If you like government then you would want people to get even better representation. If you are against government you would want people to be able to replace their representatives more easily. Being of the view that there is a distinction between the government and the electorate is redundant. If we think that the voters are communists and the state protects our liberties... or alternatively that the voters need to be protected from the market... this does not mean that we should reject pr in either case. The arguments in favour of pr do not concern a preference between the voters and the government (whether from the 'right' or the 'left') it is only a question of how best to arrange representation. If you are pro-government or anti-government pr is still the best system.