“The United Nations have made their decision, now let them enforce it” would be the response from the US government if you remove the veto power. Nothing would change. Everything the UN does is symbolic.
The UN is diplomatic platform, not a world government.
US-China tensions like this is why I don’t want to visit China. China would accuse me of being a spy and “race traitor”, and the US would accuse me of being a CCP sleeper agent.