I love people just asking "questions", the laziest version of dark rethoric there is. What's next, define human, define right?
But ok, I'll bite. Nobody made the UN king, the UN so contains a vast majority of nations. As stated, those rights are universal, and apply to everyone, including you. Since th UN signed of, basically every nation did as well. That a lot are not respecting them is a different story, but doesn't neuter those rights.
Also, those rights, one way or the other and to various degrees, are already enshrined in western democratic constititions (I don't whether or those sets of law are actually called that).
And no, human rights are not defined by a majority vote. Otherwise we would have the human right to be held as slave, to be lynched because of skin color, sexual orientation or religion, imprisoned because of your political opinion without trial and a whole lot of other nasty things.
Currently, the UN isbthe hoghest, most universal body tondefine such things we have. If sometjing better comes along, fine. For the UN to be born, we needed WW2 and millions of murdered civilians. That answers your question of who died, childreny, the elderly across fronts and beligerent nations all over the world. And the same kind of people continue to die because they don not have those rights everyone in the free democracies takes for granted.
And let's not be dicks by denying our fellow human beings the most basic freedoms and human dignity. Argueing for that isn't edgy, it is pathetic and only shows incredible levels of priviledge.