Battle, sorry I didn't see your question. I'll go back and look after I answer this.
First, can we agree that an internet message board is really an inadequate forum to discuss this topic with any real depth?
In a perfect world?
In my perfect world people would understand that there is no such thing as a perfect world. Humans do stupid shit all the time!
I think I have posted this here before it's called the philosophy of liberty..it's a pretty good illustration of where I am coming from. It is pretty specific.
First you have to believe in the right of self-ownership.
http://www.youtube.com/watch?v=muHg86Mys7ISo based on that...
I believe that Natural Law says that I own my life.
I do not own your life.
I own my property.
My property can be my land or my money or what I earn from the fruits of my labor. I should have the right to trade my property with anyone I choose to in a voluntary peaceful arrangement.
I have the right and the obligation to protect my life and my property from intruders and from an oppressive government.
Based on that set of beliefs I believe that the US Constitition was the best interpretation that some very smart men had at the time. (since then it has been degraded and turned on it's head) so it is obviously a flawed document.
Yet, based on the fundamentals of the original constitution AND the ideas behind Natural Law, the governments only job is to protect the individuals right to life, liberty and property.
Murder, assault, theft and fraud are infringements that I would consider a government job. Although many of these could also be enforced through private means.
That's my 10 minute version of a very complex subject.
Hope that makes sense.