Core Values of Voluntarism
The idea which separates Voluntarism from political ideologies is that Voluntarism seeks to abide by objective moral principles. An objective moral principle is one that may be universally applied to everyone at all times without contradiction.
How on earth is that "useful"? "th right to kill" can be universally applied to everyone at all times without contradiction.
Essentially, if it is wrong for a man to steal from his neighbor, then it is wrong for all men to steal from each-other.
OK, let's consider this "generilazation" process desirable and useful. than why are you taking as "individual" rule "it is wrong for a man to steal from his neighbor" and not "it is wrong for a man to steal from his neighbor unless it's for the common good"?
This scientific process of universalizing principles is how Voluntarism sets itself apart, and which is why Voluntaryists reject the State.
I don't see what science is involved here? I suppose the author is just trying to play the science card to validate his opinion like many religious people do.
Taxation, as we all know, is a non-voluntary interaction which is backed with a threat of violence.
Using "as we all know" is usually a bad start ;-) , especially when it's wrong. First, though many people pay their taxes non-volontarily, many do happily. I have no problem and am happy paying taxes in a nation where said taxes would be used for the common good.
Second, I may say that "Not murdering your neighbour is non-voluntary interaction which is backed with a threat of violence" as many "would be murderer" would agree with it. It does not follow that normal people aren't voluntarily not murdering the guy next door.