They determined it the best way to force a global totalitarian stranglehold on Earth, and have no choice but to continue. Most of them probably don't know that they have already lost.
WEF has no real power.
The UN and all of their related organizations only have the power an individual country gives them. Without authorization, they can't do anything. If 'Biden' gives them an inch of authority, they will be beaten back a mile by those who are actually in control.
A 'treaty' means nothing. The United States has broken them before.