"Except" would make it an exception, wouldn't it? Anyways, if people really wanted the government services the governmentalist say that people do, then make it voluntary. This would expose the amount of support these services have. Naturally, this is why the government uses force, abiet more rational and organized force.
Well it is only ONE of the MANY exceptions to your theory. There are the costs of murder, assaults, theft on a huge scale, encouragement and feeding of appetites of highly dubious safety. The Sopranos gives a good illustration of some of the huge costs of organized crime through Union looting, contract padding to pay off the boys, looting of the public treasury via mob fraud.
It ain't a society out to do good for ANYONE but a tiny crew.