Action taken against “private” property is defense, not aggression.
That does not make any sense. Are you denying the Libertarian principle that every man has a right to his own? Anyway, that confirms my fears about you aggressing against my private property…
Also, I am confused by your example. Presumably John does not own the guitar in this scenario? Are you saying that it is Freddie’s, and John has stolen it? Honestly, I am confused contextually by this.
I would say, from my Rothbardian view, if John owns the guitar, Freddie has obviously aggressed upon him. If John has stolen the guitar from Freddie, Freddie has still used more than proportional force against the original crime of Johnnie’s. For he has threatened murder against petty theft. We Rothbardians are not maximalists mate. We believe in punishment in proportion to the crime; Freddie becomes a criminal by that much more which he has Aggressed than the original crime.
Also, you are not allowed to aggress upon the owner and “seize” the workplace.