Could be just that areas with bigger governments correlate to areas with bigger populations because you need more government if you have a bigger population. Unless we want to venture into the realm of fantasy, the best hope that minarchists could have is still for a government larger (not taking proportionality into account) than even the most tyrannic government 200 years ago. The advances in population size and technology mandate larger governments.
Proportional representation could fix some of the problems that you outlined, although it removes the ability for politicians to directly represent their constituencies, it also allows minority opinions a place in government, and often forces very unwieldy governing coalitions, which stymy the ability of any one particular party to dominate discourse (thus minimizing accountability)
Monster Hunter: pissing me off since 2010.
