There’s something too this:
There is a similar situation going on with gun control in the states. The argument is always”we need the federal government to control all guns because they travel from state to state.”
This is a common theme with people on the “Left.” They realize that their policies are horrible and people will react by leaving. So it’s always not enough to just destroy one state/country, they need to destroy the whole world.
Enter the UN. Note that this week the brain trust at the UN said that we need a global tax to help the poor.
Beware the globalists.