Look at it this way, theft ("A") is illegal ("C"), whereas taxation ("B") is legal ("-C"), right? If A=C and B=C, then A=B, right? But in our example A=C, but B=-C, so they cannot be equal. Therefore, in terms of "linear logic," "taxation" ≠ "theft," IMHO.
Legal and illegal pertain to laws. Aren't we supposed to be equal in America. Declaration of Independence, paragraph 2:
... We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. ...
So, who is right, since we are all created equal? If some other jokers make taxes legal, even though theft is illegal, but I make a law that taxes are illegal just like theft, why is my law not equal to theirs?
Actually, anybody who gets down to the basics of it all, and properly proclaims his law and the upholding of it, doesn't owe any taxes. Taxes will not be taken from him. How to do this?
Stop contracting with government in the W-4 and other docs.
Require to face your accuse in court as permitted by law:
THE UNITED STATES OF AMERICA is your accuser on income tax indictments.
Your accuser can't take the oath and get on the stand and testify.
No case.
Force the man or woman bringing an accusation against you to show the contract or the injury. If you signed, then pay. If you did injury, then repay. Otherwise you don't owe.
Are you part of the laws of the U.S. government? How did you get that way? Let's see the contract you signed. Why are they calling you a citizen without naturalization? Was it your idea that you would be a citizen because you were born on a certain chunk of land?
The United States makes it easy to not pay taxes, legally. Other countries might not make it so easy. But
with a bit of work, you can get out of taxes everywhere.
BTW, this makes taxation to not be theft. Rather, it makes it to be voluntary ignorance of the law.

Just curious, how do you get out of taxes in the US? Legally, I mean, of course.