To millions of Americans, U.S. citizenship is a liability. What they get from being a citizen isn't worth what it costs them to be a citizen. Those goods they produce and consume in this land can be produced and consumed -- and in greater abundance -- without the existence of the U.S. government. These millions are being held in thrall by the U.S. government.
A recent example of the liability of being a U.S. citizen is that the world's biggest gold storage company in Switzerland no longer will service U.S. citizens due to onerous U.S. government regulations.
Millions of other Americans still consider U.S. citizenship as an asset. The solution to this significant division among Americans? Optional citizenship.