Sorry but, AnCaps and Voluntaryists believe that if a group of people want to setup their own government somewhere for themselves in a voluntary manner, then that is perfectly fine. However, if your government decides to try and force itself on other people then it is no longer voluntary and it is no longer legitimate.
Similar to if one Home Owner Association tries to expand by mandating that other people have to start paying them. This would not be tolerated by anybody and neither should government.
Also, as stated by others, if the tax is voluntary then it is no longer a tax. A tax by its very nature is not voluntary, but is mandated by some entity with great authority which can deprive individuals of their rights.
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