If you would like to understand I suggest you read the small book I linked in the original post. I think it is easiest to think about the separate functions a state government performs and try to think if they are already performed by private entities today. Most of these exist now or have in the past. This include the legal system as well as law enforcement / security services.

There is a wealth of thought and evidence on these topics on mises.org but Bob's book is a short easy read.