Why not make taxation a choice?

What is the point of having a Government, if we can help each other and ourselves without one? What does it defend, protect? We do not argue that things should not be protected, but is that Government, it (presently) does more than only defensive actions. Why does the Government do anything other than defensive actions? Is collective, Government spending more virtuous than individual spending? Then will people not choose to have someone spend their money for them? Let people have the choice. We aren't given a choice whether to pay taxes or not. Perhaps it should be a choice?