Cam, you'd pay the tax in the US if you had an income, or you'd be in jail 00 unless you were super-rich and funneled your income through various quasi-legal tax dodges...

There are probably as many "income tax is optional" believers as there are people who think the Earth is flat or people who don't believe evolution is true. They're all delusional.

Now, whether it's fair or not is a separate issue. But there's certainly nothing illegal about it.
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I can explain it to you but I can't understand it for you.