Convention has no teeth and enforcement. USA already given the finger to a lot of these International conventions that not apply to them. Think about it, if you

Convention has no teeth and enforcement. USA already given the finger to a lot of these International conventions that not apply to them. Think about it, if your country has only courts (judicial system), do you think there will be law and order minus any law enforcers? Remember Iraq and Afghan? Heck even Libya destroyed by NATO? None of these are sanctioned by UN? After Powell making a fool of himself in UN with his WMD, USA still didn't get the nod. Small and weak countries will recognize these conventions because they will get the benefit without much commitment. Big countries like USA, China and Russia will be constraint by these self-handcuff conventions and "bully" by smaller countries. Yes "bully". Think UN security councils of majority small countries can dictate the big boys what to do if there are no veto. In a perfect world, sure, majority should rule over minority even if it is tyranny (that is how true democracy work). In real world, it doesnt. Big guns and might do that. You can search Mao's infamous quote about that which basically explain entire existence of China lone wolf policy.