TLDR: the UN has been reduced to nothing, because superpowers will do w/e they want, or can get away it.
"Right, as the world goes, is only in question between equals in power, while the strong do what they can and the weak suffer what they must."
The Security Council members have a veto because they are the power brokers that be. The mass of nations without power are explicitly excluded from the conversation. It's an archaic system only because power changes over time, and neither France nor the UK are the powers they were imagined to be following the 2nd World War.