Now I do agree with you...yet (playing devil's advocate for both or us) if we make defense spending a voluntary thing, then in times of peace the funding would likely be low, and then when you need the military (say you were attacked) you likely would be caught without sufficient funding...and no time to build up (even if you could quickly raise the funds).

Not defending the military waste (at all) yet I see in this example something that would need proactive funding. Maybe there are other (better?) examples, but I do think there should be some limited central services...

I do struggle with this though, as I think (almost exclusively) politicians are corrupt, and the tax system is being abused...but I'm not sure we can do away with it all completely....