Well the state can also unilaterally take your life ( depending in the country ) and certainly your liberty. And the above is a trade-off, the state polices &

Well the state can also unilaterally take your life ( depending in the country ) and certainly your liberty. And the above is a trade-off, the state polices & punishes murder and theft etc, with an aim of reducing it overall - so you are less likely to be murdered or stolen from. Then this central mechanism needs paying for. Tax is simply a way of paying for it - and it's not voluntary to stop free-riders. The reality is you need government & laws when people start living in complex societies where people are no longer self-sufficient, but rely on a complex web of interactions. Laws are there to arbitrate between people - if you live on a homestead in the mountains they may seem unnecessary - if you live in a big city, where even essentials like food and water depend on a complex web of interactions - they are essential.