With 25 pages I don't want to look at all the posts in this thread, so I'll just make some points instead.
First, you should never trust people with absolute freedom. They'll find ways to abuse it, and if violent resistance or government action can't combat that cancer, it will grow increasingly harmful. At the other end, if you permit force too freely or regulate too heavily, all kinds of efficient activities will be blocked. Unsurprisingly, the optimal answer is probably somewhere in the middle of the extremes: some freedom combined with some regulation. Whether you live in Rand's world or Marx's, whether there's anarchocapitalism or socialist libertarianism, humans are just too selfish to be trusted.
The wealth in the world now is greater than ever before. Everything we have is built up on an inheritance that was the life's work of tens of billions of dead hands; that's already communal, in our expectations about what we're entitled to, knowledge, and the modern gifts that most of our generation (in the develop world) have been privileged to enjoy. How do you value something like instant communication when it didn't practically exist until just a few decades ago? People like to suggest that we have less today than we did relative to certain periods of the past, but that's just not true. The size of a house has doubled since 50 years ago; everyone has a cell phone and an internet connection (I would have said cable a few years ago too); cars are substantially safer and run far better; I can type this in my sleepy little college town and have it instantly ready anywhere in the entire world; and I see way too many people walking around with Starbucks every single day. If you made a person today live like they would have in the 1950s, 60s, 70s, etc., I guarantee they would have more money. And yet at the same time, if they had experienced the difference, I also assure you they would feel far less wealthy than they do now. Much of the world's wealth is concentrated now, yes, but the essentials have been nearly universally distributed to anyone who wants them, and the intangibles grant us unimaginable wealth that no one can possibly value. Most Americans are concerned solely with chasing the non-essentials, which is really astounding when you think about it...
Since society is the source of personal wealth--everyone's products being far less useful without markets and specialized trading partners--society should have the right to pursue its interest, which should be to accrue as much wealth as possible to the greatest number of people in society. The way to do this isn't to eliminate private property or the government, both actions having vastly negative effects on society's wealth, in the first instance by destroying incentives to work, in the second by encouraging inevitable abuses--too much of the self-serving behavior that's otherwise valuable. Instead, society should encourage personal wealth within the limits it sets, and no one seeking it has the right to complain, since that wealth could not exist without society. In determining the limits, we should be guided by pragmatic economic insights. When you give people everything they need, they won't work as hard; when you let people controlling a market talk about price, they raise it; when you let monopolists divide up territories, you destroy competitive evolution. All of these things are bad for more people than they're good for.
The concentration issue bothers me, but I think society should solve it by eliminating the notion of inheritance. If every person in the world, whether rich or poor, knew that they could only stand on their own personal accomplishments in life--and actually had to--many of the presently discouraged and more capable would stand up, while many at the top who would otherwise be insufficiently incentivized would act better. I'm not sure what should become of the wealth; perhaps it should be the primary means of funding the government, rather than taxes. I don't mean the government owning enterprises and real estate; perhaps they would sell whatever they got to the market in auctions or something. This could eliminate tax distortions on behavior and encourage more economic activity by everyone. I think this would be better than having so much money locked away in investments and trusts that only serve to discourage well-bred people from working. The retort is usually that preserving wealth for heirs is a motivation for acquiring wealth, but I doubt that claim. Who really works hard to acquire assets for their children? They might say that, but is it really true? For example, I saw a survey a few months ago from a retirement planning company that suggested wealth for heirs is a decreasingly important goal.
Ultimately society is probably at its best if humanity both encourages and restricts freedom. The answer is in the middle, stoking our natural competitive and self-serving instincts to an extent, generating societal wealth, while also limiting those instincts when appropriate, again creating or at least maintaining societal wealth. This will never be perfect, given that the mob is difficult to control, but it's better than the other options.