Murry Rothbard on taxation:

The first great lesson to learn about taxation is that taxation is simply robbery. No more and no less. For what is “robbery”? Robbery is the taking of a man’s property by the use of violence or the threat thereof, and therefore without the victim’s consent. And yet what else is taxation?

Those who claim that taxation is, in some mystical sense, really “voluntary” should then have no qualms about getting rid of that vital feature of the law which says that failure to pay one’s taxes is criminal and subject to appropriate penalty.