Taxes may take half of your earnings, but you'd spend that much providing the same services the government does (at least).
Then why not let me just spend my own money? I could at least make sure I only did business with companies I trust AND it would be voluntary. You're saying we should force people by gunpoint to pay for stuff that they would have paid for anyways? Brilliant! It seems like the cost of all those armed thugs is just a waste then.