He added that last part because there is so much difference of opinion on the subject.
In short though, it has to do with the use of the initiation of force to achieve what you want. That will usually decide the issue.
Most people believe things in degrees, libertarians believe that the use of force in the defense of rights is acceptable, but not the initiation of force to attain goals.
I basically agree with that premise
The attain goals wording kind of needs a little explanation before I could go along with it. For instance is a police officer turning on his red lights to pull over someone the officer believes is drunk driving a use of force, and if so is the officer using force that would be a use of force in the defense of rights or to attain a goal?
If this is not a use of force would the impounding vehicle be a use of force to attain the goal of depriving a drunk driving his vehicle?
My problem is I see most all use of force must have a goal so where are your perimeters?