“All Uncle Sugar has to do is have the IRS threaten to freeze/seize your assets. Presto - compliance!”
Uh, no. People are quite capable of setting up alternative economic systems. Here’s one example:
Irish Banking Strike of the 1970’s
http://p2pfoundation.net/Irish_Banking_Strike_of_the_1970’s
What do you do if matters deteriorate to the point where the IRS threatens to seize your home for non-compliance?