I think what he means is that taxation is the violation, regardless of whether the users are "happy" with it or not. Because if you don't pay the tax, there is always the possibility of people in uniforms carrying guns coming and dragging you away to put you in a cage.
But don't quote me on that, as I don't consider myself a Voluntaryist, or any other -ist, for that matter, and am not very knowledgable on the subject.
that sounds like something they might say, of course users don't actually pay the tax, it's a sales tax retailers have to pay and you could always grow your own tax free. And in states where it is legal it is often cheaper even with the tax because prohibition is a tax all of its own.