This document ensures that their is dignity to life etc. There are other charters and agreements in other organisations by member countries to ensure human rights etc. So as a country and globally, human lives will not go back to the savagery, nasty, short, brutish as Thomas Hobbes described in his book state of nature.
Not one Government takes papers of the UN in consideration.
Most governments don't follow their own rules. The very reason society breaks apart.
Name a few cases where the UN ordered that a human right violation is the case to unarm (or topple) a government.Pinochet died of old age.
The UN is the worst example you could have named.