Among the supporting arguments are:

1. all financial innovations of the last ten centuries have been spontaneous
2. the present worldwide financial and monetary system is loosing its reliability
3. nothing will ever prevent two agents from agreeing on an exchange one leg of which is a promise of one sort or another
4. nothing will prevent new entities from organizing and managing these promises
5. the internet and telecommunication revolution of the last thirty years makes the emergence of such a private system possible
6. no present day organized power will be durably able to thwart it
7. when present day governments of the US or of European countries have lost all credibility, new organizations will be more trustworthy
8. the process is well under way

Private entities are appearing which begin to gather more power than many states, and which are apparently well intentioned : Gates foundation, Google, etc.

Google's motto, for instance, is "don't be evil", and the firm is in the course of gaining sufficient power to issue a new private currency more reliable than many official ones.

Yet history teaches that most world tragedies had at their origin a mix of "good intentions" + "unlimited power to put them into applications" (church, colonialism, communism, etc.)...