Very few large groups are ever capable of rationally following their own interests
The evidence you produce supports the considerably weaker claim, that no group is capable of reliably and consistently rationally following their own interests, and will not always have a well defined interest.
A well run corporation, and most corporations are reasonably well run, perhaps because those that are not are apt to wind up broke, does fairly successfully follow its own interest.
The whole point of organizing a group, having a leadership, is to achieve the capability of pursuing its own interests, (unless of course, it is an astroturf organization)
If one asserts that the Israeli lobby exists and is effective, this implies that Jews organized as the state of Israel are capable of following their collective interests, or at least the interests of the state of Israel.
A corporation is usually quite capable of following the interests of shareholders.
The way a corporation accomplishes this is that there is a board, which supposedly represents the shareholders. The board is theoretically elected by shareholders, though usually it was self appointed when the company was formed, and has subsequently been self perpetuating. But despite the fact, or perhaps because of the fact, that the elections are usually worthless, the board usually does represent the interests of shareholders.
The board appoints a CEO, and delegates all power to him, subject to the limit that they may fire him at any moment. The board is supposed to monitor what he does, but not interfere or second guess him. It is supposed to allow him enough rope to hang himself, and usually it does.
This system does enable large groups to rationally and selfishly follow their own collective interest.
The systems commonly used by governments are generally less effective, but they are not totally and completely ineffective.
Recently the relatively awesome entrepreneur invested 1.25 million USD into this (seasteading institute website here).
It seems such a wonderful concept, finally somewhere where new forms of government could be tried out. But I'm just wondering how in the world they hope to deal with existing governments since their reaction to any kind of serious alternatives, especially one that either economically or ideologically presented a significant challenge, is bound to not be positive.
I was just wondering what LWer thoughts are on this matter? Also has there been any discussion of seasteading in the past that I've missed? Also I'm wondering if anyone would hazard to perhaps offer a prediction or judge how likley this is to succeed (maybe on predictionbook)?