People should watch this as a primer before arguing with libertarians...
http://justiceharvard.org/index.php?option=com_content&view=article&id=33&Itemid=10
Their fundamental premise is appealing, but ultimately deceptive.
In essence, the libetarian argument is a giant strawman; a deliberate reframing of the economic issue as one of self ownership, when the reality of taxes is that they're a reflection of indirect costs required for social economic activity. They are in essence a cost of doing business, be it by providing goods or by services.
You ARE free to own yourself. You are free to choose whether to interact with society on an economic basis or not. But if you do, just realise that there are many costs that need to be covered that would be inconvenient at best to collect from the individual, impossible (thus rendering the service impossible to provide) at worst. The services that the government and nation as a whole provide run that gamut.
It's pretty evident how broken the libertarian argument is when you watch that guy in the video arguing about how taxation equates to slavery. Except you know... the whole choice of working and actually getting money out of it thing.
As an example, just so I'm not been wishy washy about it: Roads are in nearly all instances (with exceptions been driveways, parking lots, etc) a public service. If they were a privatized service, you'd either end up paying tolls at every intersection change, where the ownership of the road changed, or pay exorbitant rates to monopolies.