The so-called "civilization" which taxes buy is a system of forced participation and oppression, devoid of civility, destructive to society, and morally indefensible.
All the things that taxes pay for can be purchased by private individuals and organizations working together of their own free will, and not because they are forced to do so. That is true civilization: civilized people cooperating to build a society where civilized, voluntary interaction, not force, is the norm.
Can you name a system, even a theoretical one, which doesn't meet your anti-criteria of being "forced participation and oppression .. morally indefensible". I don't think you can, which renders your criticisms hollow.
Human beings purchasing things from each other with no legal system? With no property rights? Is this system global, and if not then how do you interact with other nations with their own systems. None of this can exist without someone with a big stick to keep people in line.
All the things that taxes pay for can be purchased by private individuals and organizations working together of their own free will, and not because they are forced to do so. That is true civilization: civilized people cooperating to build a society where civilized, voluntary interaction, not force, is the norm.