I'm a little mystified by your latest article. Mr. Saverin owes exactly zero loyalty to the United States, as do none of us today since it ceased to be a free country years ago. He's perfectly within his moral rights to do anything peaceful to renounce his citizenship for whatever motive may be driving him.
I do believe the U.S. is still worth defending, because of its glorious past and potential future Renaissance. That, and until there appears some better place, it's our best hope for leading any sort of decent life of semi-freedom. Even so, that's a prudential calculation, not one based on any loyalty this country's citizens have coming - and certainly not its Federal government, which is about a generation away from undiluted fascism.