I pretty well understand that there are rules that are technically implemented to be enforced (protocols, cryptography etc) but when there is some problem in the system (hacking, fraud etc.) there is no one to enforce fairness. The value of given currency is not based only on technical implementations but on trust. In this case the trust and Authority is the technical implementation of this protocol (all bitcoin markets participating). The technical implementation cannot self improve. You can only trust that technical implementation (cryptography, protocols etc) are implemented as specified.