I'll also take exception to your remark. I did a quick count of 33 countries who had chosen to use the same op-out clause that China used in UNCLOS.
In the list are Canada, Italy, France, UK, Australia, Denmark , Ireland, Portugal, ROK, Russia and Spain. 4 out of 8 G8 countries. Actually 5 since USA don't even ratify it. So much for taking responsibility and consensus. At the end of the day, self-interest of nation states rules. Big countries write rules in their self interest and smaller ones accept those rules in their own self interest. Nothing more nothing less.