[Raak] How do you restrict anyone to securing public goods? Whether they are government in name or (part of) government by fact? Constitutions, bills of rights, checks and balances all seem like a good start to me.
[Raak] re your previous points about convention determining property... I think you are overstating it in a way that suggests Government is not continuous with us, the people. You could justifiably accuse me of cultural myopia here, I suppose, because I'm thinking mainly about democratic governments of the type I've directly experienced, but there is an extent to which governments may be closer to a genuine contract than the simple fiat of convention or the powerful: democracy, including lobbyism etc. is it. I'd be interesting to know whether your argument is based on a greatest-happiness idea and if so how libertarian mechanisms follow from that. As I mentioned before, my problem with systems based on high personal responsibility is that they do not recognise the moral value of protecting the weak. It strikes me that you have to bite the bullet and say (as you once jokingly put it) "a man who doesn't have enough friends to pull his plough had better starve".
Also, I note you haven't really responded to the argument about social capital.
Salisbury is festooned. There's a re-enactment of the mighty battle plus lots of celebrations in the market place tomorrow. I'd happily place a bet that every school age child in our district knows who St George is. On this subject ... I could do with some help because I have very little free time ... I have to compile 10 questions for our Sunday Quiz night [coincidentally the pub is the George & Dragon] on the theme of George & The Dragon so I need 5 'George' questions and 5 'Dragon' questions - not just historical ones. 2 easy ones that spring to mind are "what is the name of the actor who played George in George and Mildred" and "the full name please of the lizard that has the word dragon in its name?" That sort of level. Any further ideas would be much appreciated ..