I am for all effects and purposes a Political Nihilist, and really refuse to be cornered on some grid in this case. Governments and societies are mystic/ethereal constructs we put together and is nothing more than a form of complicated tribalism. People only THINK the "government" is real: political parties are like churches, politicians the priests, and their ideals their god. I believe there is (currently) a neccessity for some form of illusion of government/social structure, sure, but find them all to be flawed because people are flawed. All governments are doomed to fall. When this eventually happens, the law of the jungle, anarchism, and Social Darwinism picks up the slack until another construct is recycled from the intellectual graveyard of dead societies and a temporary truce is called. In a matter of time, the new government splits into factions, becomes old, and crumbles.
Rinse, repeat.
Standards of Left/Right and Liberal/Conservative shift on a regular basis: in the early 1900s in the US, the Republicans were actually the Progressive/Liberals and the Democrats were the Conservative branch. Think about that one for a bit.
And, like a god, no two people can agree what "government" is, because it is an abstract.
The United States is not a Democracy, even though a lot of people think so. If you listen to the Pledge, there is a beautiful little line that says:
"...and to the REPUBLIC for which it stands..."
A Republic means that politicians make the decisions, not the people. But apparently a lot of us think this is not true. You have to understand the fundamental differences between a Republic and a Democracy. If we were a Democracy all Presidents would be chosen by the Popular Vote, which they are not: they are elected by the Electoral College, which is the Politicians. Hello? Republic!
So really, for me, it is survival of the fittest. When (and if) the perfect government comes together it will be when mankind reaches a point of intellectual and emotional maturity to one day say:
"Wow. This is nice and all, but we don't need this ______ anymore."