Alas, the thread has gotten away from me. I have made an effort to skim through and have a few thoughts, however:
"If the Cato Institute was the home of principled libertarians, they probably would not have hired torture enabler John Yoo for the editorial board of their Supreme Court Review. "
The Cato Institute and its drones sold their souls long ago in order to be invited to DC cocktail parties. They have showed time and again their willingness to sell out whatever libertarian principles they have to be 'accepted' by the Ruling Class (Yoo being one among many cases in point); they are often derisively referred to as "Beltwaytarians" among those who are not so willing to 'compromise'.
Paleoconservatives (like Pat Buchanan) aren't libertarians. They're conservatives. Paleoconservatives approach political questions with a number of assumptions in hand (the inherent legitimacy of The State and most of its institutions, for instance), where libertarians do not. They also tend to inject their moral perspectives into political issues, which libertarians do not (while they may hold the same moral perspectives in their personal lives). Paleoconservatives have some overlap with Paleolibertarians (which is why Buchanan is a frequent contributor at lewrockwell.com, for instance), but the two are not synonymous by any means.
"Libertarianism is anarchism for the rich."
The last three years my income has put me just above the poverty line. I could qualify for food stamps if I wanted to. I remain a Libertarian (and have never applied for any kind of welfare), and many other libertarians I know are in similar circumstances the last few years. In my case, my recent poverty has served only to reinforce my libertarian views - despite my financial situation, taxes of all the various sorts remain my biggest expense by far, while millionaires and billionaires like Obama and Romney pay far less than I as a percentage of income.
"My issue with libertarianism is that it ignores non formal and non institutionalized forms of oppression."
I agree that this is a legitimate concern. But I'd rather fight non-formal and uninstitutional forms of oppression than the Government of the United States of America, which has nuclear ICBMs, taps on every phone and internet line in America, control over every paycheck of every wage-earner, advanced technological crowd control weapons, and millions of soldiers and police in its obedience. No matter how evil XYZ corporation gets, it will never have the legitimacy (and thus, supine obedience from the majority of the population) and power that the Federal Government of the United States of America commands.
"Curtailing the power of the federal government, while a laudable goal, just lessens the people's bargaining power with the banking, insurance, and energy industries, given the ease with which big money takes over state-level regulation and government."
The federal government does not 'protect' us from Goldman Sachs, Bank of America, Raytheon, Halliburton, CCOA, Lockheed-Martin, GD, Merck, or any of the other corporations who control The State and use it to exact wealth from the public to enrich themselves. The revolving door between government bureaucracies and the corporations they pretend to regulate make a mockery of any claim that the government protects us Little People. The best thing for us to do is drastically reduce the power of the corporate/government combine over our lives, not hope that we can someday elect some honest people who will appoint similarly honest bureaucrats to regulate these corporations who do not blink at paying million dollar bribes to these same people that pretend to represent our interest.
"Ron Paul only wants to limit federal power, he's okay with state level tyranny"
This is a slightly fair complaint. But it must be considered that Dr. Paul is running for federal office in a party and a country that frowns on freedom in general. I'm sure Dr. Paul would like to end all manner of tyrranical laws at the state/local levels, but his view of the constitution is one that gives the states broad authority to err on the side of both tyrrany and freedom. I think a decentralized federalist system is superior, since it is easier to "vote with your feet" if the border between tyrrany and freedom is a few hundred miles away rather than a few thousand miles away; millions of people have fled California in the last two decades for less taxed/fined/regulated states.
"There is nothing inherently evil about empires"
That is because all historians who write about those empires were beneficiaries of them. I'm sure if we could read the words of Vercingetorix or Boudicea or the headman of some Celtiberean village, we would all have a *very* different view of the ROman EMpire.
"in my mind the deciding distinguishing feature between the left and the right is the size of government. In that sense libertarian is far-right. These days "far-right" has connotations quite different, so the term is probably best not used, but yeah."
You have it backwards. The terms "left" and "right" originated from the court of Louis XVI in France before the Revolution. The Right constituted all those who benefited from The State - at the time, this was the landed nobility and The Church. On the Left were the petit bourgeois and working professionals, who were oppressed by the state and wanted to see it reduced in power and authority. The left are those who want more freedom from government; the right are those who like the government because they personally profit from it. In America, these terms have shifted about 150 degrees, but many libertarians still call themselves "classical liberals", and in other countries, the terms have maintained their polarity.