I want to explore what could be thought to be three ironic and even disquieting truths about trust.! I want first to argue that a socially extensive trust, that is to say, something more than trust between friends, cannot be created except in and by what I call 'aristocracies'; second, that having been so created, there is good reason to believe that the aristocrats will undermine it; and therefore, and third, that if trust is to be maintained, this will have to depend on conditions which are external to the social arrangements in question or which, if internal to them, might at first sight seem to be conditions that pre-empt anything one would want to call 'trust' at all.

QUESTION: What does the author mean by 'aristocracies' here, and how does trust get created within them only to be undermined?

Diego Gambetta, Trust - Making and Breaking…, loc. 1494